Personalized Daily Goal
Your water goal is calculated based on your weight, activity level, and climate. Not a generic 8-glasses recommendation.
Smart Reminders
Get gentle hydration reminders throughout the day. Reminders are fasting-aware — they adjust based on your fasting schedule.
Progress Tracking
See your daily, weekly, and monthly hydration trends. Track your consistency and build a habit of drinking enough water.
Quick Logging
Log water with one tap. Choose from preset amounts (150ml, 250ml, 500ml) or enter custom quantities. Takes less than 2 seconds.
Beautiful Animations
Watch your water level fill up with smooth animations. The visual progress bar makes hydration tracking satisfying and motivating.
Health Score Integration
Your hydration contributes to your daily health score alongside fasting and calorie tracking — giving you a complete health picture.
Why Hydration Matters During Intermittent Fasting
When you fast, your body loses water faster than usual. Glycogen stores release water as they're depleted, and without food-based hydration (which accounts for about 20% of daily water intake), dehydration is a real risk. Common symptoms include headaches, fatigue, and difficulty concentrating.
A good water tracker helps you stay on top of hydration during your fasting window. Learn more about optimal hydration in our guide: How Much Water Should You Drink While Fasting?
How Much Water Do You Need?
A common formula is 30-35ml per kg of body weight. For a 70kg person, that's about 2.1 to 2.5 liters per day. During fasting, you may need 10-20% more.
What Can You Drink During Fasting?
Won't Break Your Fast
- • Water (still or sparkling)
- • Black coffee (no sugar/cream)
- • Green tea / herbal tea
- • Water with lemon (small amount)
- • Electrolyte water (zero calorie)
- • Apple cider vinegar (diluted)
Will Break Your Fast
- • Coffee with milk/cream
- • Juice (any type)
- • Smoothies
- • Diet soda (debated — may trigger insulin)
- • Bone broth (contains calories)
- • Protein shakes
How FastFlow AI's Water Tracker Works
Set Your Goal
FastFlow AI calculates your personalized daily water goal based on your weight. You can adjust it anytime.
Log Water Easily
Tap to add water in preset amounts (150ml, 250ml, 500ml) or enter a custom amount. It takes less than 2 seconds.
Get Smart Reminders
Receive gentle push notifications when it's time to drink. Reminders are spaced evenly and pause during sleep hours.
Track Your Progress
Watch your animated water level fill up. See daily, weekly, and monthly trends to build a lasting hydration habit.
Benefits of Tracking Your Water Intake
Better Focus & Energy
Even mild dehydration (1-2%) can reduce cognitive performance by 20%. Staying hydrated keeps your mind sharp.
Improved Metabolism
Drinking water boosts your metabolic rate by 24-30% for up to 60 minutes. Cold water requires extra energy to warm up.
Better Fasting Results
Proper hydration helps your body burn fat more efficiently during fasting and reduces hunger pangs.
Healthier Skin & Joints
Adequate water intake improves skin elasticity, reduces joint pain, and supports kidney function.
More Than Just a Water Tracker
FastFlow AI isn't just a water tracker — it's a complete health companion. Alongside hydration tracking, you get:
- • Intermittent fasting timer with 5 fasting protocols
- • AI fasting coach for personalized guidance
- • Calorie tracker with AI food scanner
- • Weight tracking with BMI calculation
- • Daily health score combining fasting, hydration, and nutrition
- • Streak system to keep you motivated
Frequently Asked Questions
Is the water tracker free?
Yes! The water tracker, including smart reminders and progress tracking, is completely free in FastFlow AI. No premium subscription required.
Can I customize my water goal?
Yes. FastFlow AI calculates a recommended goal based on your weight, but you can adjust it up or down to match your needs.
Does it remind me to drink water?
Yes! You'll get smart push notifications throughout the day. Reminders are spaced evenly and respect your sleep schedule.
Can I track beverages other than water?
Currently, FastFlow AI tracks water intake. Black coffee and unsweetened tea count toward your hydration goal since they're mostly water.
Does it work offline?
Yes. All water logging works offline and syncs when you're back online.