Try this:
Shut off your home electricity, water, gas. Cut up the credit/debit/ATM cards.
Now carry on for a month.
No, it’s not far-fetched. It’s how humanity functioned for most of history. Most cellphone weilders today couldn’t make it.
Exactly.
How many could make leather? Or even candles?
Frugal candles - Save up all those nubs of used candles. Melt them down and pour the wax into an empty creamer carton or frozen juice container or a hole in wet sand, etc. Fashion a new wick or place a broken taper candle (with its wick) in your container. Tear the paper carton away when hardened.