This sounds a lot like the "slimming world" approach, where there are "free" foods which you can eat as much as you like (usually fruit, veg, and carb staples like rice, couscous etc). Everything else costs you points, of which you have a budget per day - it's pretty much calorie counting but using simpler units which are easier to add up. But doing a similar thing where you have some reasonably healthy and pleasant-to-eat things that you can snack on without worrying may help. Personally, the only willpower-free weight loss I managed was via medication side-effects, and I wouldn't recommend that to anyone ;) Since you see to want to do some exercise-based things, building in training should help with the weight - the key is to either make it very attractive so you want to do it, or make it something that is just part of your daily routine. I know you don't commute, but maybe find a supermarket that is further away but stocks nicer/cheaper food, and running/walking/cycling there (extra bonus as the weight on the way back will mimic your camping gear!)
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Personally, the only willpower-free weight loss I managed was via medication side-effects, and I wouldn't recommend that to anyone ;)
Since you see to want to do some exercise-based things, building in training should help with the weight - the key is to either make it very attractive so you want to do it, or make it something that is just part of your daily routine. I know you don't commute, but maybe find a supermarket that is further away but stocks nicer/cheaper food, and running/walking/cycling there (extra bonus as the weight on the way back will mimic your camping gear!)