Plastic Screw-On Water Bottle Cap

I’m creating a new beverage bottle and need a purpose-built cap that screws on securely. The cap must be molded in food-grade plastic, form a leak-tight seal on a standard water-bottle neck, and feel comfortable to open and close repeatedly... (Budget: $250 - $750 USD, Jobs: 3D CAD, 3D Design, 3D Rendering, CAD/CAM, Food Safety, Manufacturing Design, Product Design, Solidworks)