For this craft you will need a scissor, two sponges, and a string.
Take your sponges and cut them into 4 equal (as close as you can get) strips going the long way. Once you have them cut you will stack them on top of each other. So you will end up with 4 strips on the bottom and 4 on top. You can alternate colors if you want to.
Then take your string and tie them in the middle very tightly. Knot it off and cut any excess string off.
As you do this the sponges will transform into a ball shape. Spread the pieces out to your liking.
To use your sponge soaker, just soak in water and throw! You can use them in place of water balloons.