We must pay for the water we drink, the wood we get must be bought.
We have drunken our water for money; Our wood is sold unto us.
We have had to pay money to drink the water that belongs to us; our [own] wood is sold to us.
We drink our own water—but for a price; we gather our own wood—but pay for it.
We paid for our drinking water. We acquired our wood for a price.
We have drunk our water for money: we have bought our wood.