Udders, with the multi or omnifuel burner, you can use the gas canisters or petrol (from the pressurised bottle) as stated above.
As you have stated, you have a firebox stove so that you can use wood etc. when available or suitable to where you are cooking.
With the Firebox, which you can use the multifuel burner in, then all you need is a selection of pans/kettle/Zebra Billy pot and your cookset is complete.
It may be worth watching a few YouTube videos. 'Simon - A bloke in the woods' has a few advice videos about different stoves he uses and why, and which different pots and pans he uses etc. Worth having a look. Also, look at the Firebox Stove YouTube channel for ideas of how you can use that stove with all the different burners, as well as using billy cans to bake and roast etc.