Ice and dry ice can help temporarily preserve food during power outages. Dry ice can preserve food for up to two days, though it's not as commonly sold to retail customers in grocery stores.

No matter whether it's crushed or cubed, ice eventually melts into a puddle—but an alternative called jelly ice doesn't.

The food arrived in a cardboard box packed with dry ice that kept it frozen solid. I've gone back and forth on whether I prefer dry ice or ice packs for fresh dog food deliveries, but ultimately I ...