A woman named Jillee has a great blog called One Good Thing. She has all kinds of ideas and recipes to make things that are cheap and helpful. I think she's great, and her site is a good starting point.
https://www.onegoodthingbyjillee.com/
I like her coconut milk shampoo formula. It's 1/4 cup coconut milk (canned or homemade), 1/3 cup organic baby shampoo, 1 teaspoon good oil (olive oil, vitamin E, almond oil, coconut oil; I use jojoba oil partly because I always have it around), and 10-20 drops of essential oil (I've never added this but it might be nice to have a scent or the kind of healing you get from essential oils). Shake well and store any leftover in the refrigerator.
During the winter I use coconut milk shampoo every other time I shampoo. I don't shampoo every day because I don't need it, especially in the winter. In between coconut oil shampoos, I use 1 tablespoon of baking soda to 1 cup of hot water. Pour it over my hair, massage in and rinse. I follow it with a rinse of 1 tablespoon of apple cider vinegar in 1 cup of hot water. I didn't use shampoo for about three years when my scalp broke out from shampoo; my hairdresser said it was scalp acne and it was horrible. While it healed, I only used baking soda to shampoo, and my hair and scalp were never healthier. The combination of baking soda and vinegar is really all you need, but in the winter especially I also like coconut milk shampoo because the oils counteract dryness.
For laundry I use Nellie's laundry soda. You can buy a smallish can that lasts 100 washes for about $18 through Amazon or Nellie's web site. It's the best clothes detergent I've ever used. Jillee has recipes for homemade laundry detergent if you prefer to make your own and it's probably cheaper to do it that way. I don't ever use any kind of stain remover or fabric softener because I don't need it. For whitening in my local hard water, I use 1/2 cup washing soda mixed with 1/2 cup hydrogen peroxide. Mix it fast and use it right away. It's a much better whitener than Oxyclean ever dreamed of being for a fraction of the cost.
Jillee also has recipes for both dishwasher detergent and liquid dish detergent. I won't share my dishwasher detergent formula with you because through trial and error I found what works with the water where I live, and I'm sure it would be different for you. It's the same mixture of washing soda, borax, citric acid and kosher salt but I've changed the proportions. I put 1/2 to 1 cup of white vinegar in the washing cycle of my old dishwasher that doesn't have a rinse-aid dispenser.
I buy washing soda at Smith's (Kroger's in this area). It comes in large boxes. Same thing with borax. I've seen washing soda and borax at Walmart, but you have to get there early because they never shelve enough. I buy white vinegar by the gallon at the grocery store; it's usually in the canning section. That's also where I buy kosher salt and hydrogen peroxide. I buy big bags of baking soda through Amazon or Walmart online; I think they're 13 pounds. I buy organic coconut milk by the case through Amazon. It freezes well so you don't have to waste any. I buy 5 pound bags of citric acid through Amazon, and that's also where I buy organic baby shampoo. I bought a bunch of these Lock & Lock bins years ago when they cost a lot less and that's how I store washing soda, baking soda, borax, citric acid and kosher salt. It's much easier to dip a measuring cup into a bin than to lift heavy containers.
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias=aps&field-keywords=lock+&+lock
I subscribe to Amazon Prime for about $100/year. If you're on any kind of benefit program like Snap or whatever, you can get a monthly Prime subscription for around $6. It's worth it to me not to have to carry big heavy loads of groceries to and from my car. I discovered it was a godsend when I broke my shoulder and got big bags of dog food delivered to my door. I'm a Kindle addict so I use Prime for that and also the sreaming video selection, although I prefer Netflix, PBS and Acorn. I've also been using Walmart and Target's online ordering. I think they both deliver free on orders over $35. Walmart sells all kinds of things online that they don't stock in their stores; they use outside merchants like Amazon does.
I added some large storage cupboards to my kitchen/dining area for non-perishables. (I painted them to match my walls so they're not as noticeable.) I buy 6 cans of San Marzano tomatoes at a time. I buy dried beans and rice in quantity and keep them in my freezer. All of those are from Amazon, so I don't have to lug them around. I make vegetable, beef and chicken stocks and freeze in 1 cup portions. Same with bone broth. I far prefer homemade breads and baked goods to anything bought, and I slice and freeze so I can take out what I want. I use parchment paper to divide the slices.
I have a lot more time than money and baking and doing prep keeps me active, so it's all good.