If I forget that I don't have _any_ soap, what would make me remember that I'm out of my backup soap?
Also, why not just have this automated instead?
Also, why not just have this automated instead?
A backup bottle means you never are out - if you remember any time during the 2-month period it takes to use up a bottle. Or have an automated system.
Or hell, when you are at 50/25/10%, order another.
And if you are uncomfortable with it ordering it for you, it could just add it to a shopping list for you.