Non-leaky water bottles

http://www.wiggle.co.uk/p/Cycle/7/Camelbak_Performance_650ml~21oz_Bottle/5360033555

You can manually 'lock' it, so no water will come out at all. Even 'unlocked' you need to bite on the rubber and simultaneously squeeze or suck, to get the fluid out.

I reckon that last sentenced may get heavily quoted.

you dont bite it, you just place it in your gob and squeeze it