This is a useful life hack for the summer time when going on a long hike, or anytime you need to keep water cold for a few hours when you won’t have access to a fridge or cooler.

The life hack is to take a fill a water bottle half way with water, lay it on its side and leave it in the freezer. Then right before you leave for your outing fill the other half of the bottle with water. This will keep the water cold and over time the ice melt and you will just have icy water. The only tricky park is it takes some planning to freeze the water beforehand.

This brief video shows this in more detail.