I feel like you should probably join the majority of the population who live in the real world. Muffin? That was the best thing you could come up with...
I don't work in an office, otherwise that would be plausible. I work at a variety of shops, fields, schools and marquees. I spend most of my day giving talks, building things, selling products, running training and speaking to people so to get the amount of water I need isn't plausible from either a water purse or running to the fountain every 5 minutes. Seriously, you think a lot of women carry their vibes in their purses? I bring either just my wallet or a clutch, not big enough to fit anything more than my phone, cash and cards. You clearly have never been to a club in a big city, you sit out the front for an hour waiting to get in.
I'm not saying that everyday I can't have a water bottle, because 4 days a week when I'm at uni and when I go to the gym twice a day I do bring a bottle from home. I'm saying that there are times when a disposable bottle is needed.