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It started as a harmless late-night habit — my husband would wake up thirsty and drink straight from the bathroom tap instead of walking to the kitchen. At first, I laughed it off. But after months of watching him sip from that faucet, I began to wonder if bathroom tap water was really the same as the crisp, clean water from our kitchen sink. Water is water,” he always said. But one night, curiosity — and concern — got the…