Ok so here is the deal- That is pretty much it. I think it was Sean Pistol that said that his cyder exploded- that is because there was no way for Co2 building up to excape. Use the tube that goes into the container of water from the juice, Co2 escapes, allowing alcohol to be converted from the sugar. Remember, the juice container MUST BE AIRTIGHT. Drill a hole slightly larger than the tubing, and then seal it with silicone sealant. Oh yeah, pour a tiny bit of juice out first, because the tubing needs to be above the waterline inside the juice container to allow the air to escape, or else you risk the pressure building up and the juice going through the tube. You could add more sugar to the mix to begin with, even some spices too. The more sugar, the more alcohol, but you can never surpass the alcohol level where all the yeast naturally die. Different yeasts yeild different percentages, but super fast quick rise works really really well and it is super cheap. You could try to find some brewing yeast if you were so inclined, but I never have taken the time.
The one thing I left out is that you have to make sure that everything, including any drill you use to make a hole in the bottle and any tubing is 100% clean. If not, you could potentially grow a huge bacteria farm that would be harmfull to drink. This is rare, but worth the precaustion. Soon after the juice is done fermenting, it may be nontransparant. This is cause the yeast hasn't settled, and the brew is probably naturally carbonated. if you let it sit for a week after the bubbles stop and it is more clear or really clear, it is safe to drink, otherwise, it may have been contaminated with bacteria.
On a last note, I would experiment with many kinds of juices to find out what you like. Straight apple juice really tastes like shit if you ferment it, so you have to find other things that are good. We did this Wal Mart brand Lemonade, and that was really good...hmmm...anything cranberry or grape turns out pretty well too. You can always add more sugar afterward to make it taste better, but make sure the yeast is dead (no more bubbles coming out of the water container)before you add sugar and then cap it off and leave it, or it may explode when yeast tries to convert the new sugar.