I have taken DD on my own (a bit older, but still not totally independent).
We have a single ring suitcase stove, and I use firepits when available or I have a tiny charcoal BBQ to cook on as well. Anytime I boil the kettle (on fire or BBQ when possible, not getting in the way of other things cooking), I take what water I need and put the remainder into a flask for later. And if I have a BBQ, I will cook the food and then put the kettle on it while we eat to get the water at least warm and reduce the need for gas use.
Make food easy. Bring a sauce, think of 1 pot dinners. Bring a roll of tin foil and cook in foil parcels (can do that on BBQ/open fire to extend beyond just BBQ-ing meat), or to make lids for pots or cover leftovers etc. Buy a rotisserie chicken one night and some fresh crusty bread, and salad, that's dinner. A dinner of beans and an egg fried on tin-foil or a small pan in the outdoors can be so exciting. Have a packet or tin of soup to make something hot and comforting if necessary. And hot chocolate (Lidl's one to be made on water, I tend to make it in a large jug, and add cold milk to both cool and make it a bit nicer, it's always VERY much welcomed by Cubs!) is great in the evening before bedtime.
Have snacks organised for when you get back to the tent in afternoons, DCs are tired/hungry and have the potential to get cranky but you need time to cook dinner. So buy them while you're out or have them prepared before you go (carrot or pepper sticks, chunks of apple or other fruit, chunks of cheese, breadsticks, crisps etc) and a drink as well. And have a favourite or new book each so they will have some quiet time while you get organised.
I always, having learned my lesson on an early camp as Cubs Leader (I hadn't camped in almost 20 years so had forgotten stuff), have a full change of clothes for each person, from the skin out, in the car, and a towel. If it pours, especially when striking camp, you can then change before heading off, rather than facing a soggy drive home (and possibly very grumpy passengers). Just remember not to bury them under everything else (I put the pouch for this under the front passenger seat, from the front).
And don't get cold and damp in the evenings before bed. Have a pair of dry socks for sleeping, that do NOT come out of the bedroom - only put them on at bedtime so they stay dry. Wearing a wooly hat to sleep in is great to stay warm. Try to put your base layer on (whether that's thermals, or just underwear and a tshirt you'll sleep in) at least an hour before bed to warm up, and only change outer layer before actually getting into bed so you don't get cold. I tend to put a thermal top and long johns on after dinner, and then put my outer layer back on (top and a hoodie, and long trousers and warm socks with shoes to replace flip flops of daytime, or Cub Uniform) before sitting with Cubs (or with wine and DD if on family trip) or doing a campfire - I only need to remove the top layers later and pull on PJ's/tracksuit that I'll sleep in over the thermals, and my sleeping socks. (And have my hot water bottle hot too).
I only got a tent carpet this year (yet to test) but had a picnic blanket with foil backing under my bedding in the past, or foam tiles like you'd have in a playroom - to insulate against the heat loss into the ground/prevent cold rising up into you.
I find a mat, or even a sheet of flat cardboard, at the door of the tent (inside) really really handy against mud and dust. Stand on that to put shoes/boots on and off, and keep to socks/bare feet inside tent otherwise.
Another Cub leader also swears by those blue Ikea bags as individual luggage for DCs - they are wide open at the top so much easier to find things in for themselves, easy to just throw everything back into when needing to tidy tent, and generally easy to squash when packing car.