For food on 27hr games I prefer an old fashioned Ukrainian method-
Get some thin Myslivska sausages,throw them on a plate,douse them lightly with horilka(aka vodka to you western pigs) and spark it up with either some flint or a lighter-wait a few minutes and you have some nice fried sausages. If you have a metal tripod or something you can keep the fire going and maybe heat up something else you like. I use an old steel plate so after I take the sausages I quickly throw in some dried wood and brew up some tea.
Serve with Rye bread,butter and Preserved vegetable salad from a can or some saurkraut even.
I sometimes bring along some premade buckwheat porridge that I fire in a can before the game too. I might heat it up like the tea.
For sweets,nature valley bars,some fruit and those Ukrainian made 'Milk chews' you find in a lot of newsagents-Addictive as f*ck they are.
feast of champions there m8.