It's not that big of a deal but here's what happened - I use my old bottles and fill them with filtered water. Well Someone must have dranken a bottle of my water and filled it up with tap water and I could taste the difference. It aggravates me because if they think tap water is good enough for me then why don't they drink that water?? ya know! Do you think I should say something? It's not that big of a deal because I always keep a few bottles in the fridge but still!! That's so rude and I get along with everyone I work with!