great work Mr Bellend. When I used to make them back in my bartending days they had 2.5 shots of rum or 3 if i was feeling generous so between 65-75ml but if making them at home...however much you desire.
My next door neighbour made some lovely punch using Hibiscus and Wray & Nephew one summer.
I got gently guided back home about two hours later and dumped face first on the sofa.
My only regret from that afternoon was that I'd just bought a brand new pair of wet look leggings and the dye stained both my legs and the brand new cream sofa dark blue in the pattern of my thighs, knees and shins.