i use simple chemistry recipes from the internet, like fertilizer, soap, making tofu and other simple stuffs

fear? don't! ... the beauty of chemistry is that you can dilute the concentration

so if a random guy say use a tablespoon of baking soda, try a teaspoon instead or use more water to dilute

the scariest thing i did was cleaning contact lens with baking soda (feaing it will make me blind) ... i'm not blind yet and found you can use saline (nacl) sterile solution to replace commercial solution

overall my costs decreased by a factor of ten

1 kg of baking soda can provide my basic cleaning (soap, toothpaste, contact lense, etc) for a year -- nowadays i don't go to personal health section (i used to go there every week whenever i go to grocery store -> 52 x 5 mins = 260 mins not wasted)