what exactly is it saying? Theres 150 total mg in the bottle, dosed @ .1mg/100mL? Who gives doses like that. Is this shit legit?

.1mg/100mL = 100mcg/100mL = 2mcg/2mL (which is what you are taking in)

this makes no sense, you'd have to drink a tenth of a litre to get a daily dose?