I use bottles by kleankanteen.com
I have had Sigg, and they are overpriced in comparison to KleanKanteen and you have to make sure the coating stays intact.
I also have a Zojurushi and Nissin containters both of which work well, are insulated, and thus hold less because of the double-wall design.

Costco has some cheap snap lock containters that are great at sealing the liquid in tight. Cheap at <25 for a full set.

HTH