Drip Irrigation for Home garden | Forum Guidelines | Hydroponics farming in India

I am looking at initiating a project on drip irrigation for my garden in my house in Delhi. Its a split level garden with four levels. I have the option to use same water outlet or different ones.

My queries ~

1. I understand that the main drip irrigation line (16mm) is better bought from Jain irrigation since it is UV treated. Problem is they don't entertain small requirements. Does anyone know a place where I can go and buy all the components?

2. I am thinking of starting with just a manual mode and then once I'm more familiar with it, go in for automation of water distribution. Is that a valid thought or should I go in for solenoid pump et al right in the beginning?

3. We have multiple pots arranged in shelves and on parapets. I am thinking of trying out serial connections instead of having micro feeders plugged into the main line. Thoughts?

4. How recommended is it to have a filter at the mouth of the connection if the water is domestic quality? Is backflow a concern if there is a reasonable gradient for the water source?

Shall appreciate whatever help possible.

Thanks