Mythbusters - Duct Tape Island

I am in the middle of watching the latest episode of Mythbusters, which is all about surviving on a deserted island with nothing but duct-tape.  It is definitely an incredibly useful tool, just recently I have mended both my eye glasses and my tobacco pipe with duct-tape.

In their exploration of the island they came across a body of still water, and Jamie had to give the necessary warnings about not drinking it, along with other things you cannot drink.  When it came to urine, I felt Bear Grylls would have issue with that, so I put this together: