Water

Yes, as long as you aren't only drinking broth. But if you have a bad headache, you really need to drink water. I also usually have a hard time drinking water. Lately I have been buying the Nestle Splash and mixing about 1/3 of the bottle with 16oz of water. This gives a very light flavor to my water and I am able to drink more. I guess you could just drink the flavored water though. But I find that the sweetness of the flavored water increases my cravings and hunger, which is why I dilute it.