This guide will let you know how to Refill the Flask of Crimson Tears in Elden Ring. Go through the guide and follow the simple instructions to do so.
If your Flask of Crimson Tears is empty and you need to heal then you will need to find a Site of Grace and make your way up to it.
After that, press the Triangle to rest, and then get out of there after some time. Now press down on the control pad and you will notice that your Flask of Crimson Tears is full.