Here are some questions on items, water and logs.
Can we drop things out of inventory and they remain persistent on the ground, or create a cache/woodpile?
Do the streams have a current?
If swimming across are you affected by the current?
Does wood and logs float?
Can you drop logs in the stream, let them be carried downstream to be collected by another person?
Can a fence be built in the stream to catch the logs?
Finally, could we build a floating town on rafts?
Sorry, for me questions begat more questions.