I have a water-to-go water bottle in which the filter allows you to fill it up from any water source (excluding seawater) so no worries about the quality of the water source!
I take it everywhere with me as always drink loads of water wherever I am so it's so convenient.
Only catch is, it was quite expensive....£24.95 for the bottle then once the supplied filter runs out you need to replace them, although they last ages.
I'll definitely be taking mine this year so I'll always have clean, filtered, none nasty tasting water with me
I reckon mine has paid for itself already considering the amount of bottled water I used to buy.
Anyways, in case your interested
http://www.watertogo.eu