Yesterday i drank cold water from an office dispenser and it left a burning sensation in my throat that did not go away for several hours. today my gerd is bothering me more than usual. could i have gotten a bacterial infection from the water?

Water dispensers used by multiple people certainly can become contaminated by germs. However I don't consider your symptoms suspicious for a infection by bacteria or other pathogens from the water at this time. Fever, diarrhea, cough, illness in co-workers would be the what to watch for over the next days. Your stomach acid should destroy bacteria which cause pneumonia in diseases like legionella