how do i download printer drivers to ipad?

iOS does not use printer drivers. See if the printer manufacture

has an app in the AppStore, use Printopia or similar App, or

get an AirPrint compatible printer.

What printer(s) are you attempting to use?

Print from your iPhone, iPad, or iPod touch - Apple Support

Feed your preferred search engine "ios print without AirPrint" without the

quotes for some other ideas