All you need to make your own floating pool beverage bar is a pool noodle, a length of nylon line and a tapered plastic storage container (larger at the top).
Cut the pool noodle into lengths to fit around your plastic storage container.
Thread nylon cord through the pool noodle pieces and tie off. Burn the ends of the nylon cord to prevent from fraying.
Cut another length of line as a pull handle and attach this. Slip the container into the joined pool noodles.
Now you can full up the floating beverage bar, climb in the pool and chill !