SAN RAFAEL, CALIFORNIA - JUNE 03: Twelve packs of Dr. Pepper soda are displayed on a shelf at a grocery store on June 03, 2024 in San Rafael, California. Dr. Pepper has tied Pepsi for the second most popular soft drink in the United States behind Coca-Cola. (Photo by Justin Sullivan/Getty Images)Getty ImagesBoth PepsiCo (NASDAQ: PEP) and Keurig Dr Pepper (NASDAQ: KDP) have significantly underperformed the broader market this year. The S&P 500 index has posted a solid 17% gain, yet PEP’s stock price is essen ...