I don't believe in Ban on anything. Be it is on Beverages or Movies or Dance bars. There are a lot of better ways of enforcing such norms.
I think a simple statutory warning on Coke / Pepsi (for that matter anything else that contains the so called pesticides/fertilizers) would serve the purpose. People will have to use their discretion on such matters.
I think Government should step in and take measure to provide drinking water to its billion citizen. I'm paying more money on the mineral water than on Colas. I think I deserve drinking water at least for the lakhs of rupees I pay as tax (selflessly!)