This game requires a ball and a hoop in or next to your pool. Two kinds of hoops are available - the floating kind or the backboard kind. Both are available at your nearest toy store or sports store. Balls can be regular air filled balls, nerfs or water balls which are heavier and partially filled with water. Divide into two teams and determine the rules regarding three point shots, foul shots, whether shots count as one or two and how many points are need to win. Determine a half court line. The ball must cross the half court line on possession by the defensive team before they can attempt to score.