Try these fixes in order of simplicity: 1) Run your tap for 30 seconds – stale water in the pipes can concentrate the taste. 2) Use a filtered pitcher – carbon filters remove both alkaline minerals and organic compounds. 3) Boil the water and let it cool – this can drive off some VOCs and reduce temporary alkalinity.
If nothing works, get a simple pH test strip (cheap on Amazon). If your pH is above 8.5, consider a reverse osmosis system or point-of-use filter. You deserve water that tastes like water, not a back-alley spa. And hey, at least you now know you’re not insane. That soapy ghost in your glass has a name: chemistry.