Don't worry that drinking water dilutes your stomach acid or hurts digestion; alkaline water isn't a general health upgrade — it only helps laryngopharyngeal reflux in some people, alongside a diet change; and don't store lemon water in a copper bottle, the acidity pulls more copper into the drink.
The full read
Three separate claims, each tied to a named source. On stomach acid: the idea that water never 'dilutes' gastric acid and that stomach pH stays fixed at 1.5-2 is a bit too absolute — a study in Digestive Diseases and Sciences found that a single glass of water (200mL) pushes gastric pH above 4 in most healthy subjects within a minute, a real but brief effect (about 3 minutes, versus 12 for an antacid) that doesn't meaningfully disrupt digestion over time. On alkaline water: Koufman and Johnston's work (2012, Annals of Otology, Rhinology & Laryngology; then a 2017 JAMA Otolaryngology trial) shows a real but tightly scoped effect — pH 8.8 water inactivates pepsin in the lab and, combined with a Mediterranean-style diet, matched proton-pump inhibitors for people specifically dealing with laryngopharyngeal reflux — nothing that supports a general whole-body cleanse or anti-cancer use, which the post correctly doesn't claim either. On copper: several lab studies (Koontz et al., 2019; Manne et al., 2022) confirm that an acidic drink like lemon water leaches more copper from a copper bottle than plain water does, with a real risk of exceeding safety thresholds (WHO: 2 mg/L) under prolonged storage — a well-documented point. Verdict: mixed — two of the three claims hold up well against solid sources; the third (a 'fixed' gastric pH) is stated a bit more absolutely than the data actually support.
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