Expressions can also use variables. Variables have a Variant data type and the expression evaluator converts the data type of a variable from a Variant subtype to an Integration Services data type before it evaluates the expression. Variables can use only a subset of the Integration Services data types.
The total COST of each cocktail using 2oz whiskey per drink and using the higher estimate of $90 to buy all ingredients, the startup cost comes out to about $7.5/cocktail. After that first bottle of whiskey is gone, you will surely have PLENTY of the other ingredients left.
My venue only allows for a consumption bar and I naively budgeted under $1000 for this. Plan for two to three drinks per person for the first hour of the reception and one drink per person for every additional hour of the reception. I'm getting (using 150 ppl) at total of 840 drinks of wine, beer, or liquor! Using $4/glass wine (or $16/bottle) = $3360 ($2688). Liquor at $5/drink = $4200!