Heya,
Seems like you're talking about a ton of water - I would think a couple gallons would would be enough for 10 days. How many pots?
The $38 pump setup sounds fine - simple and affordable, and adaptable to a lot of situations.
The water globes work fine, but they don't work on the principle you're imagining - it has nothing to do with getting the right size hole. The video DaT found - she did not understand the principle. Her wine bottle actually is a 'water globe' - everything she did with her plastic water bottle is not a 'water globe'
A water globe works on the principle that the water can't get out unless air bubbles get in. The outlet isn't a small hole - it's wide open. When you stick it down in the soil, air has to get through the soil to bubble up and replace the water. You stick it in, a couple bubbles come up and a little water comes out, the soil gets wet and now air can't get through it, so the rest of the water just sits in the globe, suspended by vacuum. In a day or two the soil dries enough for air to pass through it, a few bubbles go up the globe, a little water comes out, the soil gets wet, the air gets blocked, the water stops, days pass, the soil dries, air bubbles up, water comes out,................The rate at which the water gets used depends only on how fast the soil dries.
The commercial ones are better, because they have a long thin 'neck' that you can push deep into the soil, and that keeps most of the soil from getting waterlogged. That's why a wine bottle with a long skinny neck would work. A standard soda bottle is no good - you can't push it deep enough into the soil. I have seen them work perfectly for house plants for up to 2 weeks My impression is that they hold 1/2 to 1 liter and should do a 1 to 2 gallon pot for 1 to 2 weeks