Abiotic components of a habitat are non-living factors that influence the living organisms within an ecosystem. These components include factors such as temperature, sunlight, water, soil, and air. Among the given options, water is the only abiotic component.

Water as an abiotic component of habitat:
- Water is essential for the survival of all living organisms. It serves as a medium for many biological processes and is necessary for the functioning of cells and tissues.
- It provides a habitat for various aquatic organisms such as fish, amphibians, and aquatic plants.
- Water availability and quality influence the distribution and abundance of organisms in an ecosystem. Different species have different requirements for water, and its availability can determine the presence or absence of certain species.
- Water plays a crucial role in regulating temperature within an ecosystem. It has a high specific heat capacity, which means it can absorb and release heat without significant temperature changes. This helps maintain stable temperatures in both aquatic and terrestrial habitats.
- Water also acts as a solvent, allowing many substances to dissolve and be transported within an organism's body or throughout the environment. It facilitates the movement of nutrients and minerals in the soil, which are essential for plant growth.
- Additionally, water contributes to the physical structure of habitats. It shapes the landscape through erosion and deposition, creating various landforms such as rivers, lakes, and valleys.

In contrast, the other options given - Tulsi, Snail, and Bacteria - are all living organisms and thus biotic components of a habitat. Tulsi is a plant, snail is an animal, and bacteria are microorganisms. Biotic components interact with abiotic components to form complex ecosystems.