Honestly, I would continue to focus on the easier stuff first. If the choice becomes "make your own", move on to another product because that's a very time cons

Honestly, I would continue to focus on the easier stuff first. If the choice becomes "make your own", move on to another product because that's a very time consuming path to do down. The only "staple" I make regularly is yogurt because it's easy, healthy (I control the sugar content), I can do a lot at once, saves money, and generates a ton less waste. Everything else in my pantry is either purchased infrequently or requires a lot of work to make myself that I've moved on to other things. Instead of trying to create those things, I try to reduce my use of them. Making mayo or ketchup isn't worth it IMO (mustard is easy though), and they're not particularly healthy either, so I just try to reduce how much I eat them. I think reducing waste should involve a more complete review of our lifestyle, not just replacing items one by one. For example, I only really use mayonnaise when making certain sandwiches, and I only eat those sandwiches because they're convenient and semi healthy. Instead of figuring out how to make mayonnaise more ecologically sustainable, I instead look for more healthy foods that I can make more convenient, like salads, burritos, and sir fry, all of which don't need mayonnaise.