Vodka dosing

Hey guys I just have a few questions about Vodka dosing, I hear its a great way to keep tank nitrates low and an efficient way to ensure water quality stays good if over feeding. What I wanted to know was can I start vodka dosing if all I have is a protein skimmer? Do I need to be running something other than the protein skimmer to ensure the quality of the water? Also, I have 90gal system 75+20 gal sump. How would I go about dosing this tank?

Any information is helpful, thanks!