>>1810184Just get the cheapest cotton tarp (as cheap synthetics degrade quickly). milsurp ones can be had for ~20€, and if you wait until a discounter offers, you might get one for 10-15€.
Or get a milsurp poncho.
And forget about "shelters". To build a shelter that'll keep rain out takes hours, and if it doesn't rain, you don't need shelter to begin with. building a shelter only makes sense if you'll stay in one spot for a longer period of time.