I can’t remember where or who taught me to always carry a spare $20 with me at all times. This simple idea has saved me many of times.
I’ve been on trips in my car where I need gas, but the gas station only takes cash. Thankfully I had a spare $20 with me to get out of the tight spot.
The best place I found to keep spare money is in my phone case. I have one of those otterbox cases that has a spot I can slip a $20 bill into. I never go without my phone so I always have some spare money with me.
The idea is simple and I highly recommend everyone do this since most everyone has a phone with a phone case.