myself personally, i hate tap water because if you look at it closely there is tiny particles that look like tiny food chunks and im not about that life. i had about 2 of these bottles when i was like 8 and i made this mistake when i got them. DONT PUT THESE IN THE DISHWASHER!!!!!!! when you put them in the dishwasher they melt and become deformed. after all this water bottle is great!! 10/10 recommend!!!!!