Piracy, some people buy 3 streaming subscriptions for 50€ a month just to watch one show.
Also depending on where you live you could take the supermarket advertisement magazines, they are free and if you live in an area where you can walk to your nearest stores it can actually save some money
I also know an old man who sells vapes, cigarettes and alcohol to kids (he couldn’ save up enougth for a good retirement). You’d be suprised how much 12yo actually pay for a vape you can buyat every store for 10€. He once told me he get’s his products from our cheap neigthbour country and only pays ⅓ of what he’s charging.
Idk about you guys, but you are legally required to have a first aid kit in your car where live, so there are plenty to salvage same is for water, there are tons of water bottles, that don’t go bad in the supermarket and your water purifier is gonna break at some point, so you’ll have to move to alcohol anyway.