Like other posters mentioned with a link, the lifeproof case is the best. I'd say invest in it, you can swim with it, drop it, get it even a little wet, dirty, whatever you can think of and it protects your phone fully.
double Ziploc bag it if you are on the really cheap side. we have a life proof for my one son(clumsy kid). we have also gone to Walmart and purchased a water proof pouch(by the phone accessories-looked like a Ziploc only stronger and had a part that could use to clip on) we have also used a case that we got in the camping section(also used it detasselling and tubing) we always worry about the phones and not wanting them to get wet!
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