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Welcome to the Community @Lorirose. As we all know, Fitbit trackers are not waterproof, but you can manually log water activities, you just need to do the following from your iOS Fitbit app:
1. Tap the exercise tile.
2. Tap the timer in the top right corner; this will take you to the Mobile Run screen.
3. Tap "Log" at the top of the screen.
4. Log your activity.
Keep the stepping up! 
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