At the very basic level, I predict how much money i expect to make in a month. Then subtract all bills and expenses that will definitely occur in the month. The difference is what i have to play with. Most times that extra goes into getting more groceries. Sometimes I can put that extra into my emergency savings which gets drained out more often than i'd like.
My dad gifted me a Dewalt Impact for Father's day one year and I've been unintentionally stuck in that ecosystem since.