I think the discussion here answered some of your questions, but yea the hole only goes in the cap, but I don't know any technical details. I believe multiple small holes are better than making the hole biggerI have actually. Don't why I didn't think of it this time.
Will need a couple of extra bottles.
Though, a liter or two will still only give a couple of extra days.
Do you only put holes in the top/cap?
What size hole would you suggest to last another day or two of slow drip feeding?
Thank you!!