A helicopter so I could fly off if it? Transporter technology? Heck, I just want that anyway.
My glasses- so I don’t end up like Mr. Bemis in the Twilight Zone episode “Time Enough at Last.” Actually if I were on a deserted island I’d probably just assume that I was on a Twilight Zone episode and spend most of my time trying to figure out if I were part of an alien exhibit; or really a robot; or I was suddenly going to start disappearing. Once I felt reasonably confident that none of those things were true, I’d work on surviving.
For physical survival:
Water filter tablets.
A Swiss army knife. (I’ve never had one but it sounds like a good thing to have)
Some matches and/or a lighter.
A ham radio. (I’m going to assume the smartphone would be rendered useless rather quickly)
Dr. Bronner’s soap.
A box of oatmeal.
An iron skillet. (useful for cooking and hitting something over the head with it.)
A bag of taco flavored Doritos. (OK. I don’t need those to survive, but I need some comfort food)
For mental survival:
A picture of my husband and daughter.
A box of mystery novels.
A notebook. (because I don’t know how to survive without pen and paper. If nothing else, I’d write memos such as “what to forage today” or “insects I think I can eat” or “oatmeal recipes).
Any other suggestions? Leave them in the comments.