Of the very many things I have learned from bad experience:
If you believe that you could come to a sudden stop, wear your seatbelt. If you believe that a forced landing into the water is a risk, wear a lifejacket, and, if you find anything other than fuel, in your fuel sample, keep sampling until you don't, and maybe even investigate further if you're still unsure the fuel is pure. Fuel screens are not perfect, and can be plugged - I've seen it.