The water tank making process involves several steps:

1. *Design*: Determine the tank's size, shape, and material based on the intended use and capacity.

2. *Material selection*: Choose a suitable material (e.g., plastic, steel, concrete, or fiberglass) considering durability, strength, and resistance to corrosion and water pressure.

3. *Manufacturing*:
- Plastic tanks: Molded or fabricated from plastic sheets.
- Steel tanks: Welded or bolted from steel sheets or plates.
- Concrete tanks: Cast in place or precast.
- Fiberglass tanks: Molded or fabricated from fiberglass reinforced plastic (FRP).

4. *Assembly*: Assemble the tank components, including the bottom, sides, and top.

5. *Welding or bonding*: Join the components using welding (for steel and fiberglass) or bonding (for plastic and fiberglass).

6. *Coating and lining*: Apply a protective coating or lining to prevent corrosion and ensure water safety.

7. *Testing and inspection*: Perform pressure tests, leak tests, and visual inspections to ensure the tank's integrity.

8. *Installation*: Install the tank at the desired location, connecting it to the necessary plumbing and fittings.

9. *Final touches*: Add any additional features, such as valves, pumps, or filters, and ensure the tank is ready for use.

This process may vary depending on the manufacturer and specific tank design.