The previous Thread was too long.
We spent 8 weeks touring 8 countries and this is how we saved:
Plan your itinerary carefully in order not to back track.
Rail Passes - investigate and research P-T-P or whether a Rail Pass is the best buy.
Hostels in Germany, Austria and Switzerland are immaculate. Inexpensive and they serve a breakfast.
Bought lunches and snacks in grocery stores or delis.