For most healthy adults, a reasonable daily amount is 1–2 glasses of lemon water, each made with the juice of about ½ a lemon, as part of your normal fluid intake.

Quick Scoop

  • Typical daily range:
    • 1–2 glasses per day is widely suggested as a safe, beneficial amount for most people.
* This usually means the juice of 1–2 lemons total across the day.
  • Vitamin C perspective:
    • The juice from one lemon provides around 30 mg of vitamin C (roughly one‑third to almost one‑half of an adult’s daily requirement).
* Some medical sources note that about ¾ cup of pure lemon juice spread through the day would cover the full daily vitamin C target, but this is far more concentrated than most people need or enjoy.
  • Hydration basics:
    • Your main goal is still your total water intake: roughly 2.7–3.7 liters of fluids per day for most adults (from all drinks and foods).
* Lemon water is best thought of as a flavored portion of that total, not something to replace all your plain water.
  • Upper limit / when it’s too much:
    • Frequently going above 3–4 glasses of strongly acidic lemon water per day can increase the risk of tooth enamel erosion and heartburn in some people.
* Very acidic drinks sipped all day keep teeth in contact with acid, which is harder on enamel than drinking a single, diluted glass and then waiting a while.
  • How to make it “just right”:
    • Use about ½ lemon per glass (or 1–2 tablespoons of juice) mixed into a full glass of water; this is a commonly recommended dilution.
* Rinse your mouth with plain water afterward or drink through a straw if you’re worried about your teeth.
  • Who should be more cautious:
    • If you have sensitive teeth, frequent heartburn or reflux, or a history of citrus allergy, talk with a healthcare professional before making lemon water a daily habit or keep to the lower end (1 glass, mildly diluted).

Simple rule of thumb:
Start with one well‑diluted glass in the morning, see how you feel, and if it agrees with you, you can comfortably go up to 2 glasses a day as part of your regular water intake.

TL;DR: For most people, 1–2 glasses of well‑diluted lemon water per day is enough to enjoy the taste and vitamin C benefits without overdoing the acid exposure.

Information gathered from public forums or data available on the internet and portrayed here.