Hydration Guides

How much water you need, what counts and how to drink it, with every number linked to its source.

Water Intake

How much water you need a day, and why your number differs from the next person's.

Start hereHow Much Water Should You Drink a Day? Find Your Own NumberThe official numbers, who needs a different amount, and how to tell you drink enough.7 min read

Your Daily Number

• Total Water vs Drinking Water: How Much Do You Need to Drink?4 min read
• How Much Water Should I Drink Based on My Weight? Charts in kg and lb7 min read
• How Many Ounces of Water Should You Drink a Day? Oz, Cups and Bottles5 min read

Rules and Myths

• Is 8 Glasses of Water a Day Enough? Where the Rule Came From5 min read
• Is a Gallon of Water a Day Too Much? Who Needs That Much5 min read

Drinking Habits

How to drink your goal without thinking about it all day.

Start hereHow to Drink More Water Every Day Without Thinking About ItTie each glass to something you already do.7 min read

When to Drink

• Best Time to Drink Water Through Your Day, From Waking to Bed6 min read
• How Often Should You Drink Water? A Pace That Fits Your Day5 min read
• Drinking Water Before Bed: How Much, and When to Stop4 min read

What Counts

Which drinks and foods count toward your water.

Start hereWhat Counts Toward Your Water Intake? Drinks and Food ComparedWhich drinks and foods count, and the few limits to know.6 min read

Coffee, Tea and Other Drinks

• Does Coffee Count as Water? What the Studies Found5 min read

Water in Food

• Foods With the Most Water, Ranked From Lettuce to Almonds6 min read