I never went busking on purpose, but often was invited to perform when I entered a pub having my guitar with me, or a friend with a guitar. So I got:
In France: Red wine galore
In Germany: White wine galore, in beer areas: beer galore.
Best happening, autumn 1963: When 4 of us went out one evening to try the new wine in a university town an elderly gentleman asked us for a student song. For every song he stood us a round. After the sixth song I proposed to check our walking abilities, and we had to stop our performance immediately in order to reach our home unharmed.

Wilfried