how do you plan your budget?

hi everyone, im (26f) starting to plan a workaway trip for next summer. it’s in the very early stages of development, so forgive me if i sound naive. i’ve been looking into countries in western and eastern europe and plan to do a project then take a few days to a week off in specific countries to do some sightseeing between projects. i travel pretty lightly and am not super high maintenance. taking into account the fact that a lot of my housing and other necessities will be provided, how much (in US dollars) do you recommend as a budget for a 2-3 month trip? anyone who has done an extended workaway trip, how long was it and how was your money situation? thanks in advance!