Hmmmm. Here we go..
If the jar has never been opened before, take a butter knife and smash the sides on the top. Enough to leave a dent in the lid. That will loosen the lid. Then take the jar and put it on the floor. Place your strong foot on the top of the lid and place your good hand around the base of the jar and open.
It may take some flexability, but it works.
Sorry you got me on opening a can. Unless you get an electrical one.
Before you take the Dog food outside, prepare to have the cat's in another room before you open the outside door. Swoop each one with your good arm and put them in a room one by one then shut the door? Then get the dog food ready and take outside.
Cutting your food will be very tricky. I'm thinking you should buy frozen veggies, or pre cut things yourself now and freeze. Or someone could cut for you?
Zipping your purse.. hmmm. How about having your purse inbetween your legs as your sitting down gripping the sides and zip?
LOL!
This made my day Cat's! lol.. Hope I helped.