i found the easiest way to not spend money was to lose my debit card and put myself on a cash budget for the week. i would give myself like 75 bucks per week, that was gas, food, and anything else that came up (out for a beer, ran out of shampoo... etc)

if i had anything left at the end of the week, i still started the next week with 75 bucks (example if you have 5 bucks left, only take 70 bucks + the 5 you have left)

I saved a TON of money with this method