Amazon: Mira 17oz Insulated Water Bottle Here's that multipurpose option. Try using the Mira 17oz Insulated Water Bottle ($14) as an adjustable weight. Just fill the bottle until you have your desired weight, then drink the water post-workout. If you'd like to try a different type of water bottle, check out these editor favourites. Image Source: amazon.com Mira 17oz Insulated Water Bottle $14 from amazon.com Buy Now