On a tarp and tents I replaced the guylines with Builders chalk line- less tangle and usually lighter. A 0.5 ltr shoulder strap bottle holder from an Umbrella cover. A small poncho from an sports Umbrella top. Reduced Backpack straps. Added clasps to a Backpack so you could have bumbag at the front waist.
I have never succeeded in drying anything overnight in a tent; damp stuff in there cause condensation, a really airy tarp set up helps.
Bin liners for a Gilet and Backpack covers when rain is very heavy
I would hazard a guess that a lot of these old farm supplies link to an underground spring often why the farm was located there in the first place and is being untouched. Not likely to being skimmed off some stream.
Seem to recall Black Sail YHA had one of these set ups but has some filtration now.