Congrats on your surgery AND on Day two!
Those first few days can be challenging. The best things you can do are sip and walk. We repeat that like a mantra around here and I guess that's really what it is.
Work hardest on getting your fluids in so you don't end up dehydrated and back at the hospital. It may take a few days before you can get in the totals recommended but it's absolutely a priority and nothing will set you back farther if you let that go.
Having said that, enjoy being on the other side! Keep us posted as your new adventure unfolds. =)