really depends!
A bottle of wine usually is good enough for me.
Have drunk crazy amounts on some nights out though - and drink straight vodka, weird drink mixes, only mix things 50/50 and god knows what else!
On my last night out I had a 70cl bottle of premixed cosmo (10%) and a vodka shot before leaving, half a big bottle of wkd on the way (it was reduced to £2 in tesco, don't judge!) and then 2 vodka and cokes and a rum and orange when out.