Earlier quoted context omitted.
Our Dutch Scouts of age 15-17 also plan their own camps and do so on a shoestring budget, and it turns out that yes you can get from the Netherlands to the Czech Republic with all your camping gear using only like fifteen different German regional trains :-)
Related: We're a Czech couple, currently planning our vacation in the Netherlands, and we too are on a very tight budget. I wanted so bad to get there by train and spend the week there riding Dutch trains all over the place, but man, the train journey there and back is just as long as a car trip (~10-12 hours) and costs at least twice as much. Looks like we'll be taking our 50 MPG car instead and since it will be the…
13:30 hours - 120 €
Look up Flixbus. It's slow, but cheap.