Stellar Water Bottles is a proposed business idea for a water bottle that contains a built-in solar panel and power bank to charge phones. The solar panel would be located in the middle of the water bottle and covered by plastic, with a tube connecting it to a power bank at the bottom. The water inside would help keep the solar panel cool, making it more efficient. The product is aimed at outdoor enthusiasts and travelers seeking a way to charge phones on the go without carrying an extra power bank.