I put a calender on the wall where I can see easily.

==> I put a calendar on the wall where I can see it easily.

When I drink or eat out, I color the number of the day red.

Whereas  I have healthy diet at home, I color it green.

==> Whereas when I have a healthy diet at home, I color it green.

It's especially helpful when I keep myself in good health and save money.

So, I try to stick with it.