I know how it is to lack both the will or energy to actually tackle food / kitchen related stuff. So here are a few thoughts.
Just make a habit of buying foods that need minimal preparation, but will still be healthy.
Examples may be frozen prepared veg, including those portioned and in steam bags ready to microwave. Also any ready prepared veg you may like even when raw (perhaps carrot batons). Salad items if you like those
Some healthy items of food you can just take from the fridge, put on a plate and eat (for the really bad days). Maybe cooked chicken portions?
If you are avoiding the dreaded kitchen sink this may help - implement my house rule (which may sound counterproductive, but actually helps).
The rule is this - you do not have to wash up everything
This is very liberating, no need to try avoid the sink because it has more stuff in/around it than you want to wash up. You can freely go to a full sink, wash 1 plate and walk away guilt free!
I found the reality was that while washing a specific item I would also wash 1 or 2 more items while there, then walk away feeling it was a small achievement.
Try it, you may find it helpful 🙂