If you must mix it with something, try this:
A good two fingers of rum
mash up some fresh chopped mint (not much) with a quartered lime, one heaped teaspoon of demerara sugar and some crushed ice
Put it all into one glass and enjoy
if that doesn't work for you then you must be mixing it wrong and I will have to come round and show you how to drink it
You cannot get the 'real' pussers rum anymore - so 4-1 with water wouldn't be the same...the stuff sold as Pussers Rum is a pale imitation according to my taste buds and memory.
If you want some fine rum then get a bottle of Ron Zacapa Centinario.
Sipping some right now as it happens.