What exactly is "free for the taking"? Water? How much may I have? All of it? Half? Or only as much as I need? Do I get more if I want to take a bath, or bathe my dog, or add chemicals and pump it into the earth at high pressure to extract oil?
There's a problem with seeing anything as "free for the taking". There's always a cost. Always a value. To me, to you, to everyone.
Best to ask your neighbors, "Hey, there's water running under my land, you wanna see if we can put in a well and use it? If we pitch in, we can all use the water. That's more useful than putting up a fence, sucking up all the water and then selling it for $1/gallon. Because eventually, your neighbors will cut your throat unless you can hire some of them to protect you from the others, and that will eat into your profits.
Ain't nothing free for the taking. Think of it as free for the sharing. Even, to some extent, yourself. Do you really "own" yourself?
Former CIA spy and writer Robert David Steele talks about a very interesting concept: "true cost accounting". It means that you have to figure in externalities when you derive price. When you go down that road, capitalism starts to look very different. It's like seeing it for the first time. I recommend his books, especially "Open Source Everything". Not so much because I agree with everything he says, but because he forces you to see things differently.