Hey I am about to bottle my first batch of wine - I was told to add this powder stuff to the wine for preserving the wine - can I just add a whole bunch into the demijohn and then mix it up and then bottle the wine or should I do it in a two step process. Put the preserver in a smaller jar and siphone the wine into that and then go into the bottle - or is there a way I can figure out how much of the stuff to put into each bottle and then go right from the demijohn into the bottles