Now that we have root and custom recovery on the Verizon LG G3 you will want to be able to flash the stock image in case you somehow mess something up and soft brick your device. The TOT file can be flashed using the FlashTool. You may also want to consider going ahead and setting up the FlashTool prior to installing custom recovery and roms. The TOT file download link is below along with the FlashTool Download link and a link to a full guide of how to use the FlashTool.
Download TOT
Download FlashTool
FlashTool Guide