Hey,
We're advocates for a bucket. We have a lidded nappy bucket. We have all used it on occasion. Pop lid back on and in morn just empty in loo and rinse. Spray with anti-bac spray, another rinse and leave outside tent with lid off to air for the day. Never had a problem with smell. Used just this last two weeks and odour free even in the warmth we had.
Also our little one is always put to use with pegs or other small jobs. She esp likes to set up her own sim and teddies etc. She's told not to touch cooker, touch as she is at home. Daddy usually takes her to the shower and not been a problem. The novelty of everything is enough to keep her amused.
I know we're not a single parent family so do have th option of sharing child watching but u'll do great. Like us u'll prob go with expectations of how to do certain situations and they'll be thrown out the tent flap and u'll find a way that works for u.
Let us k ow how u get on.
I use a bucket with wooden pellet cat litter then if it is knocked over it isn't such a problem. Unfortunately in our tent I am the most likely culprit for knocking over, I am a bit clumsy
I would also add that in a couple of years your daughter will insist on using the ladies. If you are concerned just look for someone going in to the toilet block and ask if they can just keep an eye on her. On several occasions I have gone and flushed the loo for littleies who haven't done so. I am pretty sure the vast majority of women if asked would happily just keep an eye on her
I have camped solo with a 4 year old, but I think every potential challenge is actually to do with your 2 year old. In each situation I would think 'is the 6 year old better helping me, or looking after his sister.
E.g pitching your tent. A 6 yo is well able to help - but would it be better if he sat in the car with the toddler strapped into her car seat, and played with her?
Cooking: zip them both into a bedroom compartment within earshot and tell your lad that he needs to entertain her while you get tea ready.
I think reins might be a good idea. Or a play-pen / travel cot.
Pitching the tent, cooking / preparing food and possibly washing up are your crunch points.
Remember that if the zips are at the top, they can't reach!(should you wish to trap them in the tent or bedroom for 10 mins.