I'm getting my 64 oz minimum in everyday by using this water bottle! It's 32 oz, I fill it up twice & sip all day! I love the color, it has markings to let you know if you're not drinking enough and what time you need to drink. The straw makes it so easy to drink the required water! I got it from Amazon right after Christmas for like $10! Different colors are different prices so look for the sale price! I never thought a stupid marked bottle would help me get my water in but it really does work!