Sis, this is really something na kailangan i-discuss agad with your OB, low amniotic fluid at 28 weeks needs proper monitoring to make sure baby is okay, so please don't wait on this one. Beyond water intake, your doctor will guide you on what's safe and needed for your specific situation, baka kailangan ng frequent check-ups or specific advice lang based sa results mo. Wishing you and baby all the best, and I'm sure your doctor will take good care of you both!