The Camry comes standard with a full size spare, that has been going on for years and years, I owned a 92 V6 XLE, drove a 2002 LE for a month, and my ex has the 2003 LE, yup, in the trunk under that rug and the cardboard is a full size spare.
Get your tires rotated and balanced on SCHEDULE, it really can give you more mileage than what the tire is rated for. I also get all 5 rotated at the same time, normally people do just 4, but I like knowing when one goes then it's time to do the whole car.
Believe me, in tires there is no ifs, ands, or buts, you REALLY DO GET WHAT YOU PAY FOR. I bought Vicky the best for the civic, 700 dollars after taxes, but it drives as smooth as a baby's bottom and even Vicky and her sister could not believe the difference that great tires can make.
You do not drive a lot K do you? I'd hold off and do all 4, but if you have to do 2 for now, do as interloper advised but make sure you buy the same exact brand and model when you replace the other two. I saw that at the shop so many times, people coming in and saying "I replaced some tires and I don't understand, it's different." Well DUH you dumbarse, they may be the same size but they are different brands with different treads! Also don't mix fiberglass belts on some tires and steel on the others, not very wise.