You need to source or buy the lower grill with foglight openings. You'll also need to get an oem type foglight kit (foglights, wiring harness, and switch) from the priuschat store or ebay.
Yes, as noted above, grille plus lamps and wiring harness. Complete kits with instructions, as used at the Port of Entry for installation, are available.
Here is the sticky thread for the priuschat oem foglight kit for the gen 3 hatchback. There is a link in the first post to the instructions, where you can see what you will be dealing with, as the installation will be virtually identical on your v: 2010 Prius OEM-quality Fog Light Kit Now Available! | PriusChat FYI, most Toyota foglights have identical mounting tabs on the housings. Therefore, as long as you get the proper grill with the foglight openings for your car, you don't have to buy a foglight kit specifically for a Prius v, a Toyota foglight kit for a Prius hatchback, Yaris, Prius c, Corolla, etc. will also work because you are getting the kit only for the foglights, wiring harness, and dashboard switch.