I have a small pocket notebook that I keep track of expenses in and each category gets it's own page, so photos will be on one page along with what we budgeted for that, souvenirs on another, etc. At the end of each day I make a quick note of how much was spent in each category so we have a rough idea of what is left in each category's budget. It's become a travel journal for how much we spent on vacation.
On any trip, I pre-pay what I can, and then I keep a balance book such as this. I mainly do it because I have OCD and need that control . . .
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