Now, if I were to sell you something you cannot live without, like water, the base value constants become the supply and demand and the work I need to do in order to get to that water, get it out of the well, bottle it up and deliver it. This becomes a minimum in price.
We don't disagree, I'm just pointing you out that it's not the same with Bitcoin, because those sudden drops in either the price or the required computational power can redefine the cost.
If 1 BTC is valuated at $40,000, but there's a sudden Chinese black out which affects lots of Chinese pools that contribute by owning a significant percentage of the network's hash rate, the cost of producing 1 BTC will decrease once the difficulty re-targets. But, the price has no reason to change, because the supply has remained the same (it's inflating by 6.25 BTC every ~10 minutes) and so is the demand.
Another example, but with change in demand: If there's a intensive trend of selling, which essentially causes drop in the demand, the equilibrium price will decrease. This, as a consequence, might discourage some miners, temporarily, to continue mining, because their income might have dropped by a lot. It is reasonable to assume that the cost of production should remain the same, but it's not. In the next difficulty epoch the cost will decrease.