The supply of food is generally taxed as a composite supply of service as per Para 6 b of Schedule II
Supply by way of or as part of any service or in any other manner whatsoever of goods being food or any other article for human consumption or any drink (other than alchoholic liquor for human consumption) where such supply is for cash deferred payment or other valuable consideration
Generally under GST, restaurants fall under the 5% GST rate, with no option to claim input tax credit (ITC)
In my understanding Petroleum products as well as alchoholic liquor were even outside VAT atleast in the state of Kerala. In Kerala it was taxed under Kerala General Sales Tax Act (KGST) even during the period of VAT regime. This law exists even today. Petroleum products (Only first sale in the state is taxed) do get taxed. Similarly all retail outlets as well as bars are paying tax on alchoholic liquor under KGST Act. Tax on petroleum products and liquor are the major source of revenue as far as states are concerned on which they have control, which can be hiked by state legislatures.
So in my opinion GST is applicable on sale of food beverages (Other than alchoholic liquor) and the respective state tax shall be payable as far as sale of liquor is concerned.
It should also be verified whether the respective state government has powers as per their laws to tax clubs (Mutuality concept and Calcutta Club judgment) and whether they are taxing the same. If yes supply of alchoholic liquor is definitely taxable under the state laws.