I think all my levels are too low

[rocketlily]

Here's the results from my testing this morning:
Salinity - 1.022
PH - 8.01
Nitrites - Undetectable
Nitrates - Undetectable
Phosphate - Undetectable
Iodine - None
Iodide - None
Calcium - 300 mg/L
Carbonate/KH - 70 ppm or 3.9 DKH

I am using purchased RO water. Due to the quality of our well water I cannot make our own RO water. I am using Red Sea Coral Pro salt for RO water, but nearly out so I could make a change.
I have:
Seachem Reef Complete - Liquid form for raising calcium
Seachem Advantage Calcium - Powder form for raising calcium
Seachem Reef Builder - Powder form for raising carbonate alkalinity

I don't mind adding daily, at this point I'm not looking to add any eqipment, but some of my levels are way too low. What should I add, how much and how often to bring the tank up to acceptable levels?