In the summer its hot. I like to drink SELTZER for 2 reasons hydration and thirst. I am thirsty when I drink the seltzer and am refreshed. Can I make a shahokol on the seltzer alone, or do I have to make a shahokol on juice first and then drink the seltzer?
If you are thirsty you make a bracha even on water, therefore you have no issue with this.
Shulchan Aruch O:CH 204-7 M:B 204-40.