Mine is the Reef Octopus 150 doesn't have a drip hole.
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You could also buy a replacement RO collection cup with a drain plug, but it looks like they're about $60. Cheaper route would be to do as suggested and create your own. You could probably just drill a hole and use some acrylic glue to attach a drain (just cut a piece off an acrylic tube from Tap Plastics).
Bring it by bro. I'll drill it for you
You don't have to drill the neck of the cup, it is the bottom of the collection cup that has to be drilled; a proper size bit and a tap will do for a nice job so you can shut-off the drain with a valve.