I built the site on Squarespace for easy content management, then custom-coded an interactive Build Your Own Pack tool using JavaScript, jQuery, CSS, and HTML that goes well beyond native Squarespace functionality. Customers drag bottles into a carrier, mix and match any combination of flavors, and watch pricing update live as they build their 3-pack or 6-pack. The tool supports one-time purchases and subscribe-and-save, with free shipping on larger packs.