I find myself drinking 20 ounces almost every hour I'm awake. When I don't I feel sluggish and dehydrated. I bought one of those 20oz brita squeeze bottles at target for like 8 dollars, and I carry it in my purse. You can fill it anywhere because it has a filter right in it.

I'm also very heavy though, and can sweat just from a brisk walk. Still, it's more than I've ever had to drink. During the 'flu' I drank even more. I'd go through two bottles an hour (and two bathroom breaks an hour too! Though my bladder has since adjusted and I'm not running off every hour. Which I'm very thankful for...).

Just make sure you replenish the electrolytes. With that much water, you're flushing constantly. During the first two weeks I kept bouillon cubes in my purse. And would have a powerade zero when I stopped by a convenience store.

also, if your in keto, your urine will be darker. the deeper you are into ketosis, the darker it will be. toxins are stored in body fat and when your body relies primarily on dissolving body fat for energy, those toxins your body safely packed away are released and flushed out. that's why drinking so much water is so important when in ketosis. if you're getting plenty of water, see it as a good thing to know all of that bad stuff is being released and flushed out.

I drink tons of water on keto, granted I live in a high altitude and am active, but it's a necessity regardless. In addition to water, I'd recommend a zero cal Gatorade or Powerade to help keep electrolytes and sodium in balance. Like the others said, broth is great too. I use Pacific beef broth and add some evoo, pepper and Swiss cheese, tastes kind of like French onion soup. Easy way to get in sodium, a meal and fat to help with the dreaded flu.

It does indeed sound like that's not enough. Try increasing salt a bit, and water intake by a factor of 1.5 of what you're already taking. In your case, six instead of four. Feel better soon!