Add hydration tracking in Nutrition with fluid units

User would like a hydration tracker under Nutrition. Right now, when trying to add hydration on the nutrition side, the app only offers grams. They want the ability to log hydration using fluid units instead of needing to look up conversions manually. This would be a nice-to-have usability improvement. **Attachments:** 🖼️ Image 1: https://media.publit.io/file/aXwyNH7u.jpg