Whether to use a kalk reactor, or any sort of KW drip, as opposed to a Calcium reactor is a debatable issue. For now, at least, KW will be perfectly sufficient, as you will have a low calcium drain for quite some time. But, I'd hold off on adding too much KW for a while; let your Ca and Alk levels stabilize, and your tank ph without the addition of KW. Those kent marine drippers work okay for KW, but only if you mix it in a separate container, let it settle, then transfer the clear liquid to the dripper. Otherwise it will clog very quickly. You can also bring your levels up with a 2 part additive, or just use calcium chloride and baking soda. This would suffice for balancing the Ca and carbonate in the new seawater.

Eventually, as your calcium demand increases due to calcification of corals n your tank, you'll probably want to consider either a kalkreactor or calcium reactor. Since you built your skimmer, I'm sure you'll be able to build either of those devices; they're simpler than a skimmer.