It really depends on your cat & what you feel comfortable with - does your cat get into a lot of trouble, or is she pretty mellow? Will she eat dry food? I don't think canned would be OK to leave out. If she can only eat canned, I'd have someone come in & feed her once a day.
I can't leave mine alone anymore because of their age/health, but when they were younger I used to leave them for 2 or 3 days at a time quite frequently. I would leave out plenty of dry food in bowls & take the lid off the container so they could tip it if they needed to just in case I got delayed coming home. I usually put out 2 extra litterboxes as well (for 3 cats). I'd also do this:
Originally Posted by Enuja
I make a Signs-style mess out of my house when I leave my cats, putting water in something like 10 tupperware containers that are not normally on my floor. It's probably not necessary, but it makes me feel more comfortable.
And if you don't use any type of chemicals in your toilet, you can take the lid off the toilet tank (the top part where the filling mechanism is), so if something happens and the bowls get spilled, they can still drink from the tank, which will continue to fill automatically so long as the water is on.
I also tie up all the window blind cords, just to be safe.
Make sure to check in & out with someone who lives in town & knows you'll be leaving the cat, just in case something happens or you get delayed.