There are 2 different physical sensations for tasting salt. One for low salt that tastes good and one for high salt that tastes bad. This is believed to help regulate salt intake.
Slightly salty water shouldn't taste bad. Soda and Gatorade are both relatively salty. If you are dehydrated, you might even prefer water with a dash of salt. In fact, Dasani et Al, carefully control the salt balance to make the flavor right.
But yeah. Water is tasteless so a pinch of salt goes a long way when there is no fat or protein (or sugar) to cut it.
Dasani and Smart Water have high salt to mineral content, they're my favorite brand of bottled water. Pure water tastes bad and is actuality dangerous to drink regularly
Overhydration is a rare but fatal condition that occurs when someone consumes too much water, leading to an electrolyte imbalance. As little as 1 liter an hour can cause this condition. Distilled water has the highest chance of causing this condition with little to no benefit other than taste. Taste preferention is also uncommon as we've generally evolved to seek out mineral-rich water