Klean Kanteen is one of the premier stainless steel bottle makers on the market today, and they don't charge an arm and leg for a product that is sure to last. Our favorite is the insulated version of their classic build. It can keep your coffee hot for 24 hours, and you water cold for over 90, which is impressive. The stainless steel material and vacuumed insulation limits any flavor altering and is BPA free so you don't have to worry about the liquid you put in your bottle and are more likely to consume it at the temperature you had intended.
Available at KleanKanteen.com for $37.