I used to track it all in a spreadsheet by hand and eventually turned that spreadsheet into a web app which I (and a few hundred others!) are using today. It's

I used to track it all in a spreadsheet by hand and eventually turned that spreadsheet into a web app which I (and a few hundred others!) are using today. It's called Lunch Money (https://lunchmoney.app https://lunchmoney.app) if you're interested.