Here is how I would go aboout ceiling yyooup some water...

Add a goodly amount of water to an aluminium kettle obtained from a jumble sale, set it on the Aga and bring it right to a boil.

Take your Lexan bottle, top off with a couple of halfpints of pure Devonshire water, twist up the stopper until nearly done up like a kipper, and immerse in the boilling water.

Boil the dickens out of it for a game or two of Snakes and Ladders. Let it boil, don't be a nosey-parker. Then remove the bottle with a pair of long-handled Mole-grips. Don't be a gormless git and splash the water aboout on your trousers. Do up the stopper right tight, let cool, and Bob's your Uncle, your water is nought manky!