This site states the format directly: a liquid dropper in a 1 fl oz / 30 ml bottle.
You measure each serving yourself with the dropper rather than swallowing a pre-filled pill. The site says to use the recommended serving from the current product label, so the label, not this page, sets the amount.
The site pairs bottle counts with supply lengths: 2 bottles for 60 days, 3 for 90 and 6 for 180. That works out to one 30 ml bottle per 30 days, consistent with a once-daily routine.