Why do I drink more when I have a water bottle??????
If I’m drinking from a cup it’s like “Water? I don’t know her”
But if it’s a water bottle I’m like
My guess would be that humans have been drinking from waterskins for millennia, while glasses are relatively new. Maybe to our subconscious brains, water bottle = Waterskin (clean, safe, sealed), while cups = Gross, open, dust and dirt and whatever, may as well drink from a puddle.
More likely to see it, more likely to have it close. Glasses have to be kept on stable surfaces. Water bottle allows you to have it on you all the time and you can throw it on your bed or in your bag. The convenience allows you to do the slurps more often