As far as water goes, honestly, unless you are not using vendors or playing in a single biome without rivers or lakes, try and locate a water purifier mod for your helmet. I play almost exclusively in coop with 2-4 other players that are family and I would safely say within the first 7 days we find a water purifier mod, or the instructions for one. We then share the helmet to drink from a water source and then as we progress and find more filters, dehydration is irrelevant. We still make dew collectors, but they are pretty much just for cooking or ingredients for recipes. I don't mind the lack of jars anymore, it does make it a challenge at first, but it becomes less of an issue fairly soon.