are there any places near you who can deliver your groceries, or any online grocery shops who deliver to your area?
Cooking large portions and freezing (sorry dont know about freezing the foods in your diet) can help cut down preparation time.
As far as cleaning goes, you can look at doing a time and motion study for each task. Analyse the movements involved and see if you can't streamline the process. Things like moving cleaning equipment closest to where it is needed, keep the laundry hamper in/next to the laundry (if you are able to).
Also with most tasks, 80% of the results come from 20% of the efforts, maybe have a look and see if everything you do is absloutely neccesary.
Another key is clean as you go. Do the dishes while you're cooking, leave the duster out and just pick it up everytime you walk past it and dust things on the way to where you're going and leave it there till you walk past it again. As you walk around the house doing things, tidy. Pick things up and take the where they belong, that way you don't have to do it when 'its time to clean'.
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