Unfortunately, no. Licensing laws are pretty strict and only alcoholic drinks purchased from the hotel may be consumed on property. Any items brought into the hotel will be confiscated and returned to you on departure.
Drinks can be purchased by credit/debit card or you can add them to your room account, where they will be off-set against your pre-authorisation charge. Or, take away the stress and pre-order your drinks, just ask your Party Night Coordinator for more details.