I recommend Finger Suit Press-on Nails.

The product I am using is the Finger Suit Press-On Nail. It comes with nail tips, a wooden stick, a prep pad, and a mini file. It is a very convenient product where you simply choose the right size tip from the 40 options and stick it on—that’s it! I have used many stick-on products before, but they all felt uncomfortable. However, this product felt completely natural, so it wasn't uncomfortable at all. Also, the colors are so pretty that I was just as satisfied as if I had gone to a nail salon. The staying power isn't the longest, and they do fall off if you touch them too much, but since there are so many tips, it’s fine because you can just find a tip of the right size to stick on if one falls off! There is also a clear version, but since I bought it in the fall, I purchased the opaque one. I plan to buy it again.