Needs to learn sometime

We are camping this summer and camping usually involves swimming. Now my son is a smart kid and can usually pick up on something pretty quick but swimming to him has been a mystery. My brother has recently purchased a house with a pool and since the weather has gotten warmer we have decided to take advantage of this and hopefully by the time July comes around he will know how to at least tread water. We even went out and bought him some pool toys like a kick board and goggles and my brother has got a inner tube for him to play with. By the time we are done with him he will be swimming with the fishes....so to speak.