Lived in Orlando for a year myself. If your looking for night life I have a few quick suggestions
Saturday - Cowboys Bar (cant remember the area but its about 10-15 mins from Disney) it was 10-12 bucks for guys to get in but then its ALL YOU CAN DRINK...albeit it Bud Light.... Just bring the empty bottles back
Sundays- Howl at the moon 3 drinks for 5 bucks...just down the I Drive
Weds- Chillers in Downtown Orlando is like 10 bucks to get in but budweiser and slushy drinks are 1 bucks each!
NOw its been a year and a half since I lived there but I know some people who are back working/living there who still go to Howl and Cowboys so I imagine the prices are the same.
As for the price of booze, the store I bought booze from (Attached to walgreens on the 525 right next to Disney) I got 24s of bud light for 9.99, 40 ounce bottles of vodka, rum, rye for as cheap as 16.99 but generally only about 20-24 bucks. So it can be cheap when drinking out but its dirt cheap to buy at the stores.
Also if your staying in the area of Disney I strongly suggest a large restaurant/bar called "Ale House" They have after 10pm specials where doubles go down cheap to something like 3-5 bucks. Also try what is called an "Irish Car Bomb" if you have never had before . Ale house has got a massive menu and when I was there alost all menu items were under 18 bucks and its massive portions! They do buckets of beer 1 or 2 days of week where its 5 MGD or Bud (IIRC) for 5.95 +tx.
Any other questions let me know!
Also 2,000 pouds for 14 days? Thats just over 3,000 US which is wayyyy overkill if your only spending for yourself.... Unless you want to go large with hotels etc!