How can I reinstall Safari in my iPhone that accidentally deleted?
I accidentally deleted it.
Did you remove the app or completely delete it? If you removed the app from your home screen, swipe from right to left on your first home page until you reach the App Library and see if it's there, where it can be moved back to your home page.
If you really deleted Safari, open the App Store and search for Safari, where it will be shown with a cloud icon next to it and toughing the cloud will redownload it to your iPhone.