I used to work for a guy that refilled magic markers. Don would pull them apart and use a little bottle of India Ink to refill the tampon in them. He was the cheapest man I ever met, and I quit about six months after I'd gotten a raise, and that's what he said, "I gave you a raise and you're quitting on me?"
My aunt had 4 kids. They all used the same bathwater, oldest to youngest, then that bathwater got scooped out and watered flowers. She always grew an amazing garden.
Me, on the other hand:
I've washed ziplocs and re-used them. I cleaned out the fridge last month and threw food away. That's the first time I've ever thrown food away that wasn't rotten or moldy (and I'll eat moldy bread if I can rip the mold off), and I'm 46. I legit needed the room and some of it just didn't mold when it should have.
I actually prefer single ply TP, so that's good, but I typically replace tires in pairs and just rotate 'em front to back. I collect the drip oil from my Mobil1 5-qt jugs to use in the lawnmower. God only knows what viscosity it actually is, as I bounce to whatever is close and will work and is cheap.
I fingerbang every coin return I see. I got a silver quarter just the other day. One time I found an ancient Roman coin in one, and one time I found a 1oz silver eagle.
I rotate my underwear and socks in batches. When it gets old, it ALL gets replaced and I mark the whole batch and use them in the 'workin on stuff' clothes drawer, and keep the new ones for nice days. Even then, I still pass for practically homeless.
Every hotel I stay in gets all the tissue boxes, soap, and shampoo taken. If they have cereal boxes at the continental breakfast, I'll take half a dozen to my room every day for home use.
I eat food way past the expiration date. My bath towels get laid on the floor to serve as a bathmat after I get a fresh one (less hair, water, and dirt to mop up and I'm too cheap to buy a bathmat). I set my Tstat to 55 in teh winter and use a room heater to heat the bedroom and live in there if it gets too cold.
I saved the salt from tanning a deer hide for the next one. That's a $3 savings! All cardboard boxes get used twice, even if just to save a trashbag. My trashcan is literally only full once every three weeks. My neighbors are usually overflowing weekly.
I reload shell casings and pick the range clean, including the trash cans, if I do go shoot. Even .22 brass recycles, and I collect metal to recycle.
I save envelopes from bills (I pay online) and use them to mail my own stuff. Bonus if it's a prepaid!
I wear a pair of shoes until they're shameful. Then they're yardwork shoes.
I won't reuse spark plugs, dead batteries, or condoms.