I once drilled a hole in a coconut and stuck an empty tube from a highlighter in it. It was harder to drill through than you'd think! Melted the highlighter cap and stuck a small socket into it. The drilled a hole on to and stuck a small tube in there to act as a mouthpiece. Worked pretty well. Of course we didn't waste the coconut water and we totally munched on the coconut afterwards. It was pretty cool.