Well the gold often mentioned is more "shiny stuff" that lay around the surface imo, just if someone else considered it valuable.
Gold in the ancient times was on the surface of the earth and in caves... But for obvious reasons it isnt anymore. Howvere, I don't think gold has much of a purpose anymore (don't think it can do much platinum can't).
Water is also kinda worthless so the anology doesn't really follow I don't think... Most of western europe have springs and lakes that carry drinkable water (not sure about the rest of the world).
Gold will also retain its value, as well as many centuries and millennia before. Regarding water, then it was never useless. This can be confirmed by people with a hot climate. But in the future, taking into account global warming and climate change, the cost of fresh water will constantly rise in price. Glaciers melt and mix with the salt water of the oceans. In lakes and rivers, the water dries up. This trend will continue. Therefore, fresh water will be of great value.
As for bitcoin, so far no one can say for sure about its future. We can only hope that his future will be beautiful.
Yes, fresh water in the current climate change environment will be in increasing demand. Who thinks that the reserves on our planet are inexhaustible, is mistaken. In the future, fresh water will rise in price. The demand for gold will be about the same. But it is hardly worth comparing the price of gold or water with Bitcoin. These objects, in my opinion, are not comparable.