Klean Kanteen TKWide Insulated Stainless Steel Water Bottle
Klean Kanteen's 12-ounce TKWide Insulated Stainless Steel Water Bottle ($22) features a pop-up straw for quick sips between reps and an inner layer that claims to not retain flavours. So if you put lemon in your water one day, after washing your bottle, you won't taste lemon forever.