[Terr_]

I do this but for something I think is even more critical: Toilet paper! (Running fully out is much worse.)

The "last" roll of last resort is cheap 1-ply, and it serves as an unavoidable reminder to restock and replace it.

[joshstrange]

I just keep a 2-package buffer minimum. Only 2 unopened packages (of like 6 rolls)? You're out, order more or add it to the shopping list. Packages opened are effectively empty and don't count. Honestly I use this for most consumables, having that buffer is so nice.