pontoons

i recently ran across these while investigating a set of r/c airplane pontoons to affix to my phantom... Anybody have anything like on their craft? Or know anybody? The thought of water anywhere near my drone makes me nervous, but if you're flying over water it seems like a great safety device...

I'm flying over water more often then over land and it's just a matter of time before.... Where can I buy pontoons for my p4p? How much flying time does it take away? Thanks, Chuck