You can sterile distilled water before putting it into the water container (don't use tap water), So you will not have contamination issues.

Thank you very much Majid Sharifi for your suggestion.

I find it to be very helpful

Thanks a lot Pawan fairs for your valuable suggestions ;

I am already using sterile distilled water but the problem is in my co2 incubator because its collecting water under it and I'm afraid of potential contamination

Thanks again dear.