Lesson #1 Water resistant in the world of mobile electronics is not waterproof.
Lesson #2 Put it in a zip bag or it's gonna get wet.
Lesson #3 Military water specs are a JOKE. They are allowed to basically splash water at the unit and fog it with a mister and it passes. Most any electronics will pass these tests. Mil Std doesn't have provisions for submersible units. I believe the correct waterproof spec is JIS-7 if memory serves correct. If it's Mil Std 810 anything it's resistant and I think the JIS-7 spec says it's good for 1 meter for 30 minutes.
Buy something like this and keep it in there.
http://www.waterproofcases.net/aqp-104.html