There are a few things you need to build a water dock. You'll need sturdy posts, beams, and joists to create the frame of the dock. You'll also need decking material to cover the frame and make it into a surface that you can walk on. And finally, you'll need some way to secure the dock in place – either by sinking pilings into the ground or using anchors. The best material for a water dock depends on your location. If you're in an area with salt water, then you'll need to use treated lumber or some other type of waterproof material. If you're in an area with fresh water, then untreated lumber will work just fine.

There are a few things you'll need to build your dock: -Pilings: these are the posts that will hold up your dock. You can use concrete, metal, plastic, or wood pilings. -Stringers: these are the boards that run between the pilings and support the dock decking. -Decking: you can use lumber, composite lumber, or plastic decking for your dock. -Fenders and cleats: these keep your boat from banging into the dock and help secure it in place.