I always have a bottle of water with me, but especially when I am going to work out. Nothing is more annoying than trying to shove a few ice cubes into the little opening of any bottled water. It never works and I always end up with ice cubes all over my kitchen floor.
So I am totally in love with the SiliconeZone Bottle Ice Tray (2 for $8.99), which makes slender ice cubes that will fit in water bottles, sports bottles, and even cans-- Making any drink cold and ready for your work out. Buy them here.