Meet SkiffDaddy: a drink holder for boats, kayaks, and lawn chairs that can hold cans, cups, glasses, and bottles. It fits kayaks, golf carts, patio chairs, and boat railing. It is easy to attach and remove. SkiffDaddy has a durable design and does not require any drilling for you to get started.
You can also use SkiffDaddy to hold glasses, snacks, and other items. Costs under $25.