The water tastes like distilled water that has been stored in a plastic container. (The type of plastic used in the weatherproofing sheeting Merrin's gear included has been extensively studied in dath ilan, and is not known to have negative effects on human metabolism to be exposed to very small leaching from, but it's in fact meant for weatherproofing shelter and not as a component in a freshwater still, and unlike her actual drinking water collapsible containers, it has not been thoroughly optimized with a lining that doesn't affect the water flavor at all.)
Most of Merrin's written reference materials are in digital form and can be accessed on her reader tablet or her multipurpose display screen, both of which Merrin has been using only when she really needs to and which, the rest of the time, are carefully packed away in a sealed storage box to minimize their exposure to temperature swings and humidity and extend their useful life.
There's still quite a lot of random Baseline text to skim, but it's mostly in the form of labels, inventory sheets on her storage boxes, safety checklists, and maps.
Some of the latter are standard-issue from her kit; on those, and on the labels, the text is almost impossibly regular and perfect, each letter-form almost identical every time it appears. Some are handwritten, on a substance that...isn't not paper, but isn't like any paper Esta will have seen before.
(Only some of the paper Merrin had in stock is the ultra-durable waterproof paper. The tradeoff isn't so much that it's more expensive to manufacture than other types of paper – it is, but when Exception Handling is equipping a highly specialized endurance medtech, even for simulated training purposes, that is not really the operative constraint. But Merrin had expressed finding the specialized everything-proof paper mildly more annoying to write on and was also mildly annoyed that she couldn't casually crease-and-tear it to separate notes and needed scissors, and so she did also have a supply of more ordinary dath ilani stationary, which is not immune to degradation from exposure to humidity swings. Her cave has kept it out of the UV, but for anything she wrote up more than a planetary month ago, the paper is now very slightly discolored and starting to curl a tiny bit at the edges, and anything she wrote more than three planetary months ago is now rather weathered-looking.)