You know how hot it gets in the summertime ? Well I have a tip for you all who like to travel. When the ice in your travel cups melt entirely, here's a helpful tip for homemade ice for a travel/yeti cup. Get some fruit/applesauce cups that you get in the store, when finished with the fruit. Wash out the cups and pour filtered water just below the rim of the cups and line them up in a muffin pan before putting it on a flat surface in the freezer overnight. Two or three will give you ice for ice tea or water in your travel cups for hours. When the cups are frozen just dump into a bag to enjoy.