you'll spend $8.50-$15 for cocktails, and $6-8 for beer everywhere at WDW. The prices really don't vary much (maybe 50 cents less for a cocktail at a resort restaurant than in the park) But essentially it's the same drinks menu everywhere. Each restaurant may have a couple of their own "signature" cocktails, and a specialty beer (like the Italian places will carry Moretti beer) but you'll pay the same prices from one to the next places.
We have also found that the drinks kiosks (the little stands outside the countries) tend to be light-on-alcohol, especially the frozen slushy drinks that are very popular like the grey goose slushy and gran marnier slushy from France kiosk...margaritas outside Mexico, tea-alcohol beverages outside China, etc. They taste good, but for $8-9 a drink you want a little kick to them, ya know?
Strongest drinks, in our experience, are the ones at the resort restaurants. Love the various mojito concoctions, and for frozen, love the pina colava (both available everywhere.) Also like the glow-cube drinks (but you pay extra for those...$12-14 range.)