Simple method of dosing alk?

[ponokareefer]

I was looking for the simplest method for dosing alk. Presently, it is the only item that is being depleted in my system that water changes are not replacing. I have to manually add alk to my system daily, so was looking for a simpler way of doing this, in case I go on vacation, and don't have to count on someone else doing it for me. I recently baked some baking soda to use instead of a Seachem product, as the price was a lot less. I have looked at the GHL profilux dosing pump, with 1 pump, but believe that I would need to buy more items in conjunction with this system. I want to avoid a calcium reactor as I don't have the room to store it.
My system is 125 gallons, with a 55 gallon sump. I have a mainly softie system, but have a hammer coral, a small birdsnest frag, and 3 clams(1 being 15 inches long).