Consumables, multi-use?

I am looking for suggestions. We do these. Have others?

Bar soap: cut in 1/2/dried... goes to kitchen sink... then goes to bathroom sink... then small pieces go into the shower pump with water.
TP cores: used as intended... then in firestarters (or plant pots).
Milk cartons; as intended...then hold "goopy garbage" (no garbage disposal or chickens/goats) stapled shut and taken to dump.
Sheets: as intended... to rags (I don't sew.)

We reuse wood, both in home projects and in the woodstove.

I could make a much longer list of things I use as intended and then do a single-reuse. I'm really looking for things like the bar soap where I use the product as new, use it almost to the end of that use and then found a way to keep using it to the bitter end.

I buy in bulk supplies we use all the time. Work at eliminating unnecessary purchases continually. But I'm stagnating and looking for inspiration.

Jennie Little wrote:I'm really looking for things like the bar soap where I use the product as new, use it almost to the end of that use and then found a way to keep using it to the bitter end.

I put half-used bits of soap into crochet bags, a different colour for each person, and hang them in the shower room. The whole bag gets used as a personal washcloth and zero soap ever gets wasted.

One example I can think of at our place is that we use Castile soap as our soap for our laundry, hand soap, dish soap, shampoo. We have the foam pumps and I think we add some essential oil in the shampoo and hand soap.

We irrigate some garden beds with the grey water we produce and this ensures we do not have any issues.

Hmmm, we use essential oils in home made soaps, lip balm, candles, medicinal salves/lotions and in the diffuser.