Hello everyone. I had a checkup with my doctor yesterday, they said I'…

Hello everyone. I had a checkup with my doctor yesterday, they said I've gained weight and have swelling, the doctor told me to drink up to 1 liter of water per day. Today I had an ultrasound, pelvic presentation and hypovolemia. With hypovolemia, it seems like they advise drinking more, but I don't know what to do. The doctor is from the old school, she's over 70 years old.