been invited camping for a weekend. im a total plank about such things so what will i need?

[mamazon]

for me and 2 children.
my brother has a 3 man tent which i am going to pinch. its small but i figuered its only for sleeping on so not such a problem.

we are meant to be going on the august bank holiday weekend for 2 nights.
what are the essentials i need and how much do they cost. everything needs to be as cheap as poss or we wouldn't be able to go.

TIA

[Skribble]

wind up torches and lanterns are great, get them everywhere now even pound shop for torches, great if you fall asleep with them on. Poundland also do a 24 led tent light, its light weight enough to hang up and supposed to have hours of light

But will need a torch for loo trips etc.