Nausea!

Got it! 

dasani   has a lot of chemicals. Try real spring water and see if it makes a difference. I also have to. Put a lemon. Slice or something with a little flavor I it. Can't do plain water since. My sleeve. 

Dasani water is purified (reverse osmosis) water with some minerals added back in for taste. What chemicals are in it, aside from dihydrogen monoxide and the minerals?

If she's drinking the flavored Dasani, that's different. But the plain water is jus****er.

I get sick on spring water or tha****er u can get at Walmart. But name bran like aquafina it don't bother me? I don't no.

It's the pH.

This happened to me, too...just this week.  I think Crystal Light helps but isn't really what I want to be drinking so I'm going to try natural additions like lemon or cucumber and mint.  I'm hoping that helps.  If not, I'll go the other way on the pH scale and see if the baking soda helps a bit.

One or the other should do it.  There is also some info on surface tension that I didn't really get.  If it continues to bother you, look that up too.  The bottom line, added fruit solved my problem in the short run and the problem disappeared completely at about one year out.

Interesting info!  I too have trouble with plain water. As soon as I add something,  goes down much easier.