There are mayn opportunities where to sleep. Please ask Honza Rott for details.
Budweis: Camp (showers, etc.) just by the river or rooms at the same place: raftingcb.cz (price about 15 EUR per night)
Austria: Camp (showers, etc.) just by the river (price about 15 EUR per night)
Lipno Devils race: Place for cars and tents just by the river at Prokopava lavka (mobile toalets) or campsite (showers, etc.) in Vyssi Brod (4 stops by train shuttle)