Gaza’s bakeries will run out of flour for bread within a week, the U.N. says. Agencies have cut food distributions to families in half. Markets are empty of most vegetables. Many aid workers cannot move around because of Israeli bombardment.

“We depend entirely on this aid box,” said Shorouq Shamlakh, a mother of three collecting her family’s monthly box of food from a U.N. distribution center in Jabaliya in northern Gaza. She and her children reduce their meals to make it last a month, she said. “If this closes, who else will provide us with food?”

The World Food Program said Thursday that its flour for bakeries is only enough to keep producing bread for 800,000 people a day until Tuesday and that its overall food supplies will last a maximum of two weeks. As a “last resort” once all other food is exhausted, it has emergency stocks of fortified nutritional biscuits for 415,000 people.

Fuel and medicine will last weeks longer before hitting zero. Hospitals are rationing antibiotics and painkillers. Aid groups are shifting limited fuel supplies between multiple needs, all indispensable — trucks to move aid, bakeries to make bread, wells and desalination plants to produce water, hospitals to keep machines running.