1. Choose already opened snacks that are packaged with a ziplock seal.
    to reduce tampering evidence.
  2. Select a different shampoo bottle to use every time you shower.
    keep your own empty products hanging around the bathtub so the others don't get suspicious.
  3. Keep track of where he/she keeps a ton of the same things.
    and when you're alone, slowly accumulate your own collection. Like tampons. And money.
  4. When you eat his/her fruit, rearrange the remaining ugly, bruised leftover pile to look as full as before.