[.:4:.]

Realistically, a single burner gasmate cartridge style stove will set you back under $30 from bunnings. You can get 4 gas canisters for $5. A 2 burner is closer to $50. So cheap as. If you're camping close enough to a small town, you dont need a fridge. An esky with a bag of ice in it will last the best part of 2 days staying cold, if not 2 and a half days. So $4.50 on a bag of ice isnt going to run you poor. Keeping warm, thats easy. Jumpers and a sleeping bag. A/c in a tent? Thats not camping. Worst case a tea towel in the esky.
So yeah a tent and something to sleep on. Basic utensils, basic cooking gear. Esky, food, some form of water storage, clothing and bedding and you should be able to spend a few nights away but not be roughing it per say. Also take a hammer for tent pegs.