5 litres of 95% spyritus vodka, to use as a mixer.
Very, very bad idea..... trust me bad idea. You won't have a party, every one will have two or three drinks and then ZONK!!! everyone passes out, I'm not kidding I have experimented with Spiritus and it completely and utterly ***** me up and then i pass out period.
Stick to vodka.
vodka-shop-wodka.eu/Finnischer-Vodka/Vodka-Koskenkorva-13-60-10-Lt--353.html?language=en
If you want something strong may i suggest this Finnish vodka called Koskenkorva it is 60% abv.
This will also completely mess you up, but Spiritus you are seriously risking alcohol poisoning.