Question: acids you can find at home?
Answer: Acetic acid (HC2H3O2) is found in vinegar as well as products that contain vinegar, such as ketchup.
Citric acid (H3C6H5O7) is found in citrus fruits. ... 
Lactic acid (C3H6O3) is found in milk and other dairy products.
Ascorbic acid (C6H8O6) is vitamin C.