great

Hi.
I am interested to have a long-to-very-long trip (adventure) around Europe, camping, walking and get around to 22 to 26 countries around Europe and eventually northern Africa. All this in an undefined period of time.
Since my 1 year experience of live and study across Scandinavia i could say that with 150-200 euros/month you can eat and drink almost everything. But with traveling i think is something else. What should i expect?