On the dashboard, scroll down to the “Nutrition starts here” section and you’ll see the card labelled “water” with an “add glass” button next to it. Click add glass for a quick water log. 

Alternatively, you can click the blue-coloured, plus-shaped button that appears on the bottom right corner of your screen and select Log Water. This will take you to a screen where you can change the units to litres, glass, or bottle.

There is one other way to log water. From the notifications you receive that are prompting you to log your water, if you tap on the notification itself, you will be prompted to log the water you drank.