Along the via Francigena there is a less developed network of locations to stay overnight which are documented. For the trajectory Cisa Passo del to Piacenza I am very grateful to use it.
In Germany, the E1 through the black forest (West way) at regular intervals Wanderheime of the Schwarzwaldverein are situated.
In Wallonia the list: Gilberts list handy. This annually updated list gives shelter to a low price, indicating the GR route passing by.
Problem when fixing a location where you plan to spend the night is that they must correspond to the day stages. The length of a day stage depends on the actual distance, total ascent and descent in meters, and also to the efforts to be made of the day (s) previously or subsequently. All this you can only estimate the spot, so you must be prepared to adopt your plan from time to time.
I take a single-person tent with me, so I do not have to worry if there is nothing in the nearby stage when the day comes to its end. This means an extra 3.5 kg in my backpack for the tent, sleeping bag and mat. Alternative to the tent is the knock at a local farmer for a place in the hay, a system that in a previous cycle trip to the Basque country work well. The tent should also help reduce costs, because especially in Italy and Switzerland, if you walk alone you easily pay between 50 and 60 € for a bed and breakfast.