How much do you spend on alcohol in a pay period, (honestly ) be it weekly fortnightly etc?

I spend about $40 a fortnight, which buys me a case of (6) champagne It lasts me the fortnight easily because i drink it with soda ..

Do you buy alcohol when you want it, or do you budget an amount per week? Do you 'splash out' on something different if you are going to a party?