Water bottle is very cheap there buy domestic one like Lavie or asked the front desk to deliver to your room a 5 litter water judge it is cheap to us$1 or little more. Make coffee or tea with it too!
Ema san is right it's a general rule the place where a lot of people seat(thriving) is good to enjoy! Don't worry too much about perished food it's better now but if you're allergic to msg then have medicine with you.