@mahesh ji you can charge 1ltr or more water at once and drink it whole day. Please note 1 sip of charged water contain same energy equals to whole charged water, once an amount of water is charged with VK remains charged till you finished it.
So in this case you can wear your VK rest of the time after charging water at once for the rest of day. You will get healing whole day with water charge method and wear VK as well.