[72deluxe]

Every purchase can involve a receipt. Put the value of the receipt onto a spreadsheet after each purchase. Discard the receipt. Get into a habit of doing it.

Also, spend on a credit card instead of debit. The credit card takes the fall in case of fraud or scam but this is not the case with debit cards and you'll be out of pocket.

Alternatively, spend each item on different credit cards, eg. fuel on one, food on another, partying/treats on another. You will be able to quickly see how much you're spending using their apps, or the realisation of how often you're getting one particular card out of your wallet.