Based on the search results, it is unclear whether Charlotte Tilbury Flawless Filter is water-based or not. However, the search results provide information on Charlotte Tilbury Airbrush Flawless Foundation, which is a full coverage foundation that is transfer-resistant, humidity-resistant, sweat-resistant, and waterproof. The formula is matte, yet not flat, and contains skin-loving ingredients like peptides and Charlotte’s proprietary blends that prevent the product from looking or feeling too dry. The foundation is also enriched with deeply hydrating Moss Cell Tech™ to promote long-lasting hydration and reduce the appearance of wrinkles. The foundation is medium coverage, but can be buildable if you prefer a heavier coverage. It is available in a luxurious oval-shaped glass bottle with a pump applicator and contains 30ml of product. Some users have reported that the foundation can pick up dry skin parts when the skin is dry, but it does not dry out the skin.