To honor it's famous dressing the company created two bottles for the (unofficial) National Ranch Day on March 10.
Since the bottles were also created in part for the upcoming Royal wedding of Prince Harry and Meghan Markle, one bottle will go overseas, possibly as a wedding give to the couple. Or not, depending on which article you read.
Ranch dressing enthusiasts can win by retweeting Hidden Valley's tweet about it between March 10 & May 19. The winner will be announched a few weeks later.
Please note that the winner will have to pay taxes because prize winnings are considered taxable income.
Sources: The Delish tweet Money Delish