Have all players climb out of the pool and stand about 5 feet away from the edge. Everyone in the pool has to have a color of the rainbow base on their swimsuit. Those with multiple colors should choose the color that is the most prominent or their favorite color. Stick with red, blue, green, yellow and orange - the colors of the rainbow and thus the name of the game! One or more people can act as judges if they don't want to get wet. One person should have the hose with a sprayer on the end and stand several feet away from the rest of the group.
The Judge calls a color and those who have that color must jump in the pool and go under the water so the person with the hose can't tag you with the hose by spraying you. Whoever is the first person in the pool who hasn't been tagged with the hose wins! Pool.