That is not good when the heat index is 115, and I work outside. And have a history of heat exhaustion. I do try to hydrate before going to races and sporting events that will have me out in the heat all day. But a string of really hot days can wipe me out. I've been trying to drink more - I've been adding a splash of juice or a squeeze of lemon to water to make it more drinkable.This is not too practical when I'm not home. I've been having a vitamin water with lunch (in addition to my coffee) but it's too many calories to drink more than one in a day.
I have to be really careful of artificial sweeteners. They can trigger migraines. If I'm going to someone's house that uses them I take some med's first, but I can't use them regularly.
The other day I found Crystal Light Pure in the store. It said no artificial sweeteners, preservatives or flavors. But it was only 15 calories. I read the labels. They use truvia ( made from the Stevia plant) mixed with sugar. This intrigued me, as stevia can have a weird side of the tongue taste. The little bit of sugar seems to avoid that. I bought the lemonade. (As a warning I don't like strong or sweet lemonade- gee thanx grandma - my lemonade is more like a half lemon squeezed into a glass of water with a splash or simple syrup) It was a bit too strong/sweet, but half a packet works well into a bottle of water.
This still only helps with a bottle or two, but it's a start.
Today, I left work an hour early to grab Excedrin and an hour's nap in the ac.