My med school allowed us to use Citrix to access Epic on our iPads. This is literally the normal Epic you see on a computer, but on your screen. There is a feature where you see the mouse and "scroll" across the screen with your finger to move the mouse (the mouse doesn't go where your finger is, just moves the direction your finger moves). Actually worked pretty well. Still somewhat clunky and not great for data input, but theoretically you can do everything.
My hospital now has Canto which is more like an "app". Easier to see stuff but limited (like others said, no orders, images, etc).
I actually bought a $200 Chromebook for hospital use. Water resistant, drop resistant, 10 hour battery life, 12", 2.5 pounds, etc. Best of both worlds. If you want to spend a little more, you can get one that folds on itself and it touch screen. I think this is the most practical option.