My H2O is not waterproof either but that's because I opened it (and drilled a hole in the back), which ruins the glue which is the only thing holding the water back - how long would you trust glue to do that.
The cover is another weak point in that it's hard to tell whether it's closed properly. You can half-close it and never notice that it doesn't stick perfectly.
My recommendation is to use this device for reading, not for waterboarding.
If you must use it in the bathtub, avoid water anyhow, don't submerge it or if you happen to accidentally drop it into the water get it out immediately.
Don't rinse it either, what for? For cleaning it, even just breathing on it will give you enough moisture to get rid of fingerprints and such - using the microfiber that came with the reader or similar kind of soft cloth.
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