How to get my camera app back on my IPhone 5s?

How do I get my camera app back on my IPhone 5s?

Restore it.

You can't delete the default camera app installed; however, all other apps you have downloaded from the App Store can be redownloaded by opening the App store, then click Updates -> Purchased, then from here you can scroll the All or Not on This iPhone lists (drag the blue slider), click the app, and you are golden.