The WikiHow site has an article titled How to Make Mayonnaise in their Recipes category.
There is also an article on How to Make Yogurt.
Although there doesn't appear to be an article [yet] on how to make tofu [soybean curd], the the article How to Prepare Tofu has some clues. Quoting the article:
" … [tofu is] basically just coagulated and pressed soy milk, very similar in production to cheese … "
The article also mentions freezing as a way to modify the texture of tofu before preparation, and talks quite a bit about the need to remove the water from tofu before preparing:
" … The best way to make the texture of tofu more appetizing is to press it for 1-2 hours before cooking or marinating it … "
" … most tofu is packaged in its own liquid (which is quite bland and monotonous) -- this liquid is actually the source of the dislike many people claim for tofu products, because when the tofu solids are saturated with the liquid in which it was packaged, other sauces, marinades, etc are prevented from soaking into the tofu. "