Haha, my former housemate had a real bugbear about audible breathing. I ended up getting quite a complex about it, and am now hyper-aware of the volume of people's breathing and have trained myself to breathe as quietly as possible. Keep your mouth shut, go about it slowly, don't exert yourself, and you should be fine.
It's probably quite sad that someone else's foible has seriously affected the way I breathe, isn't it?

Playing devil's advocate for a minute, there was a whole catalogue of misbehaviour detailed in the paragraph ending in "sipping water - play ruined!". Perhaps it was all these behaviours combined that ruined the play and not *just* the water sipping.