How is it empty with water in ? The answer to "do you mean hot dip galvanising or zinc plating ?" is not " yes ", it has to be one or the other You can buy plating kits from places like Frost.co.uk but hot dip is not something you do in an empty tank with water in.
I think you might be confusing Galv with Passive plating. Galv requires molten Zinc, where as Passive plating only requires mild heating of chemicals and electricity