I don't have a safari

Safari is a core part of iOS, it should already be installed on your device. If you don't see the icon for it anywhere, you may have restricted it so try checking on Settings > General > Restrictions and make sure that Safari is not disabled. 

Search for it. Swipe down from the middle of any home screen and type Safari into the search field at the top of the screen. If it is in a folder, it will show the folder on the right of the app name after you tap on the app when it appears in the search. 

You can also Reset the Home screen layout which will return Safari to the home screen as long as it isn’t restricted. When you do this, it returns the home screen to out of the box condition and it will destroy any folders you had on the home screen. Settings > General > Reset > Reset Home screen layout. 

If all else failed, then the last resort is to Restore your iPhone.