Simple: Make your own yoghurt from powdered milk
A 1kg bag of milk powder costs about $7, and will make about 10 L of yoghurt, so it is a very cheap way of making yoghurt! I use an easiyo thermos, which costs around $20, but if you have a small eski or drink cooler that can fit a jar, you can use that to make yoghurt too. I see easiyo thermoses at markets and op shops all the time, I bought a second one from the dump shop for $2. Look out for one, buy it and make cheap yoghurt! See my posts about yoghurt here.
Simpler: Use natural cleaners
I usually don't clean with anything much more than hot water and a cloth, but if I need something stronger I use vinegar. If you using expensive chemicals at the moment, you can try making cheap and natural cleaning mixtures instead, see here and here.
Simplest: Soap nuts
Soap nuts have worked out to be so easy to use and better for our greywater than using laundry powder, and about the same cost as laundry powder, read more here.
What do you think? What are some other ideas to get started with a simple life? I will have more next week....