Well, it'll certainly work - there's basically everything there you need. Just a few comments ...
Plum wine is sometimes difficult to clear, especially if you haven't used a pectic enzyme - which you haven't. However, it doesn't matter in the least. You may end up with a hazy wine, but it's perfectly drinkable. The wine should end up at about 15% alcohol (which is pretty strong) if you used wine yeast. Having said that, your comment about activating the yeast in warm water makes me think you may have used baker's yeast. If so, you'll still get wine but the yeast may not be capable of fermenting all of the sugar - in which case you'll end up with a slightly sweet wine.
Don't be too hasty in your bottling. It is not a good idea to rack into bottles as soon as you think the fermentation is over - that way lies a lot of explosions and mess. I don't know what you're fermenting your half-gallon in, but if the wine fits in there with only little air space, then rack it off when you think it's finished, rinse out the container and then put the wine back in it, complete with the airlock, and leave it in there for as long as you can bear to. You can always top up with tap water.
Enjoy
Mike