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These packages change from time to time but Thomson will provide you with a list which will be reasonably comprehensive, including a wide range of cocktails and spirits, but a limited choice of wine and beer. Bottled water is normally not included, nor are premium spirits such as malt whiskies. I did find there was a very good range of drinks available.
You usually only get house wine for free, but in my experience it is ok, and so long as you get a good wine waiter he/she will keep your glass topped up.
The other point is that alcoholic drinks that aren't free in the package are reduced in price, in some places considerably so, as, I think, are things like non-alcoholic cocktail.
Non-alcoholic cocktails are free too, as are a very long list of alcoholic ones. Also sparkling wine by the glass. Bottled water not needed as you get tap water at lunch and dinner poured for you automatically.