Waterproof cases for iPhone 5c (that are compatible with glass screen protector)?

I got a new iPhone (5c) about three months ago and when I got it I got a slimmer otterbox along with a 0.4mm tempered glass screen protector. It's worked fine.
Recently, while I was brushing my teeth, my phone fell out of my puny girl pocket and into the toilet.
I don't think I have ever reacted raster in sticking my hand in a toilet.
I'm convinced that it was by no other power then some mystical force that my phone still works perfectly even after being fully submerged or probably about 5 seconds with no case on it.

But with that scare, and the summer here while being a competitive swimmer and pool lifeguard and spending a good half my life around water, I want a waterproof case.
Also so I can take cool underwater video of me swimming and teaching my brother to be an Olympian and such.

I was willing to buy a LifeProof case, but was unsure of weather it would fit I the my screen protector. I would hate to take it off as I'm clumsy and drop things a lot and probably would not have the LifeProof on all the time, purely when I need it for the water, being I have the otterbox.
Does the Lifeproof support the protector? Any other waterproof iphone case bean suggestions?

Do a search on MafPul. They are best known for making military rifle magazines and accessories for military firearms - however - they do make an I-phone specifically designed to protect cellphones under combat conditions. They are American made, not cheap - but - not overpriced either.

Here is a link:
http://store.magpul.com/category/125

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