YES, you may bring on the food/catering of your choice as well as any beverages including alcohol to set up your bar. You will need to bring your own cups, ice, cooler, barware, utensils, etc. and also be responsible for taking these items off of the pontoon when you return to the dock.
Note: the Palapa Bar Tour with Beverage Service & Bartender includes: juice, soft drinks, bottled water & alcohol listed on the homepage. There is no need to bring anything but your food/catering.