It's true, no one seems to be able to agree how much water is the "right" amount.

My antidepressant causes some dry mouth symptoms, so that prompts me to drink more water than I probably would otherwise.

I'm also lucky to live somewhere where the tap water tastes good enough to drink straight from the tap. If it didn't, I'd probably get a water filter. Since I haven't had a car and have to transport my groceries on the bus, I have pretty much given up buying bottled water.

I drink lots more water during the summer when it's hot. I'm probably easily drinking 4 liters per day at the moment, but as it gets colder, I'll drink less.

I don't think it's really anything to worry about too much. If you find yourself feeling hungry or tired at a time of day when it's not expected, though, drinking some water will often help. It can help if you get a slight headache, too.

Is a person's water bottle "fashion gear" in the UK like it seems to be these days in the US? I have a re-used plastic bottle that originally contained water, but I see lots of people with BPA-free plastic bottles or stainless steel containers that cost around $40.