Maybe swimming and sailing.
I don't really think water is going to relieve anxiety, that being said, it sure can't hurt you!
As Rooster implies, it is an excellent medium for delivering "the oil of conversation, the philosophic wine, the ale that is consumed when good fellows get together, that puts a song in their hearts and laughter on their lips, and the warm glow of contentment in their eyes; if you mean Christmas cheer; if you mean the stimulating drink that puts the spring in the old gentleman's step on a frosty, crispy morning; if you mean the drink which enables a man to magnify his joy, and his happiness, and to forget, if only for a little while, life's great tragedies, and heartaches, and sorrows; if you mean that drink, the sale of which pours into our treasuries untold millions of dollars, which are used to provide tender care for our little crippled children, our blind, our deaf, our dumb, our pitiful aged and infirm; to build highways and hospitals and schools, then certainly I am for it."
If you have never come across the "If by Whisky speech," read the whole thing here: https://en.wikipedia.org/wiki/If-by-whiskey
(It relaxes the superego which is good for anxiety."
Drinking it? Not so much.
Sailing, boating, swimming, fishing? Oh yeah.
Sitting on a rock just watching it? Best of all.
But in the cells at Gitmo? No way, José.
Floating in it water is relaxing. I use to go to my local swimming pool for a good floating session, the only downside is people poking you to see if you're alive.
Maybe mixed with some Wild Turkey might help !
Soaking in it all warm and bubbly or being held under it?
The former tends to release anxiety whilst the latter will increase it exponentially.
I suppose it would depend on what you do with it. It's always good for your health to be properly hydrated, but I don't see it relieving a bout of anxiety.
If, however, you mean by soaking in the tub or sailing on it, or just sitting quietly watching rolling waves on a beach .. Then .. Yes, I suppose it would help to relieve anxiety. It has a calming effect by reducing negative stimulation.
I don't think so. Maybe you can try to listen some light music, do some exercise, go out for a walk or have a trip. Most important is to make yourself relax: www.euask.com/topic/1300-How-to-make-yourself-relax-when-fee