Abood Okal, a 36-year-old American father trapped in Gaza with his wife and young son, told ABC News on Sunday about the difficulties getting drinking water and bread.

"And I think it is for many people here in Gaza. We are almost out of drinking water today," he said. "I think we have enough just to last us through the night and then tomorrow would be basically out."

Okal described them spending their days not only "trying to figure out our water situation," but also trying to secure bread, telling ABC News he was part of a group that spent six hours standing in lines in front of bakeries.

"We hit four different bakeries to buy bread and any type of bread, actually, and it was a total mayhem, just like we expected," he said. "And actually quite heartbreaking to see the amount of people lined up in front of the bakeries, hundreds and hundreds of people in front of each one."

Okal said they stood in line for hours to get one portion of bread -- "which is about 25 to 30 pieces of pita bread, an average sized pita bread," he said -- "which basically would be good enough for a day or two at most."

"I think Gaza has reached a point where it does not matter where you're from or how much money you have or who you know," he said. "Everyone is in the same boat in terms of the dire daily struggle to survive. And certainly our family is no exception to that."

-ABC News' Zoe Magee

Securing the release of the hostages being held in Gaza is still a priority as Israel expands its ground assault in the territory in an effort to defeat Hamas, the White House's national security adviser said Sunday.

"We are continuing to see if there are ways to make that happen. We are prepared to support humanitarian pauses so that hostages can get out safely. And we will keep working at that every day because the president has no higher priority than the safe return of American citizens and wants to support the return of citizens of other countries and Israelis, as well," Jake Sullivan told ABC "This Week" co-anchor Martha Raddatz.

"Now, how exactly that happens ... I cannot predict that. All I can tell you is every effort is being undertaken right now to do that," Sullivan said.

But he noted "there are ongoing efforts which I can't get into detail on television, including regional partners, including the Israelis."

-ABC News' Tal Axelrod

Israel's expanding ground assault on Gaza will involve months of painstaking and "very fierce fighting" with Hamas extremists amid conditions "unlike anything that we’ve seen in recent years," retired Army Gen. Robert Abrams predicted on Sunday.

"And simultaneously trying to ensure that the Israelis do not target, unwittingly, the locations on the hostages -- this is going to prove to be a very difficult task," Abrams told ABC "This Week" co-anchor Martha Raddatz. "And we’ll just have to see how their plan plays out here over the coming days."

Abrams, who commanded U.S. troops during America's invasion of Afghanistan and Iraq, went on to say that he believes Israeli forces face a nigh insurmountable challenge in their stated goal to destroy the militant group that launched a terror attack on Israel earlier this month -- while seeking to limit civilian casualties in the Palestinian territory and recover the hundreds of captives Hamas is thought to be holding in Gaza.

"It’s going to be what I would consider nearly impossible to destroy Hamas, to eliminate their capability to do harm to Israel and the Israeli people, while simultaneously protecting what some people have estimated as to be a million Palestinians who are in harm’s way and they can’t get out of harm’s way," Abrams said.

Israel has faced mounting international outcry at the potential humanitarian disaster in the blockaded territory as it carries out its retaliatory operations on the militants.

Abrams said on "This Week" that he thinks "every effort is being made to follow the laws of armed conflict" but acknowledged the "horrific" images being broadcast of the escalating conflict.

"Fundamentally, at the end of this, Martha ... we still have to answer the question: What is the future? Hamas was created as a result of a lack of a separate Palestinian state. A two-state solution, as many people have talked about. That has to be somewhere, when you asked, 'How does this end?' That has to be part of the equation," Abrams said.

-ABC News' Adam Carlson

The number of people believed to have been taken hostage by Hamas during the Oct. 7 terror attack on Israel has risen to 230, according to Israel Defense Forces spokesman Rear Adm. Daniel Hagari.

During a press briefing on Sunday morning, Hagari said bringing the hostages home remains a top priority and that Israeli forces on the ground in the neighboring Gaza Strip are working to achieve this goal.

The IDF expanded its entry of troops into Gaza overnight, joining the forces already fighting on the ground there, according to Hagari.

"We are gradually expanding the ground activity and the scope of our forces in the Gaza Strip," Hagari said. "The operations on the ground are complex and include risks to our forces."

Over the past 24 hours, the IDF struck 450 Hamas military targets in Gaza. Ground forces directed IDF aircraft toward the targets and also struck "terrorist cells" that attempted to attack them, according to Hagari.

The IDF also struck Hezbollah military positions in neighboring Lebanon in response to attacks on IDF positions, Hagari said.

The IDF will draft new soldiers in November as was scheduled, even during the war, according to Hagari.

-ABC News' Anna Burd, Bruno Nota and Morgan Winsor

The U.S. is "not drawing red lines for Israel" and is still in "active negotiations" to release hostages, White House National Security Council spokesperson John Kirby said during a virtual briefing Friday.

Asked whether the U.S. was given advance warning of the expanding ground incursion happening today, Kirby would not give any detail on conversations with the Israelis, but said President Joe Biden has been getting daily briefings from his national security team.

Pressed on whether the U.S. is confident that Israel has thought through what happens after the ground incursion, Kirby said it's up to the Israelis to answer questions about the "soundness of their planning and the effectiveness of the execution."

Kirby said Israel should support a humanitarian pause if it can allow for the release of hostages.

-ABC News' Selina Wang and Fritz Farrow