I agree with pranam77, that the project's quest isn't in the electronical field. Interfacing an electronical instrument with a GSM modem is a highschool or engineer student beginners project in my opinion. But determining water quality isn't generally easy.
It strongly depends on the nature of the monitored water resource and the kind of possible contamination. Conductivity can be an indicator but it doesn't directly monitor contamination. Other parameters accessible to online monitoring ar pH-value and turbidity. The latter is often used to monitor the operation of water filters. Some parameters, e.g. sterility can't be determined online by state-of-the-art (at least with affordable means).
Added after 7 minutes:
Regarding the said conductivity meter, I fear, you didn't understand the promoted application. It's for monitoring of reverse osmosis or demineralized water quality. It's not suited for well or mineral water.