M.B.
D.,
I found myself SO thirsty when I was pregnant - I drank tons of water - but had to lay off just about everything else. I found that I preferred 'cutting' fruit juice (don't pre-mix it with water, you'll get sick!) with water, to having the entire sweet thing right then (barring cranberry, would drink water first then cranberry, yum!)
Soy milk is delicious - it is much better than it used to be. If you are looking for a close match to Milk - try Silk plain, ice cold. If you are looking for slightly sweet, and have ever had a 'steamer' (steamed, flavored milk) try Westsoy Vanilla in the microwave (too long to wait for the stove! :)
There are other 'milks' out there too - hazelnut, rice, almond, all of them taste pretty good, if you're not doing a taste test with milk, they all have their own flavor.