First of all, for the ants, I wrote my solution here. Click on the link to see the full post:
Secondly, if your feeder is leaking, I would abandon it. Leaky feeders cause more trouble than they do good. The simplest feeder you can use a good quality Ziplock type freezer bag, about quart size. Half fill it with your sugar solution, carry it out the hive. Lay it on the inner cover and slash it once or twice with a very sharp razor blade or craft knife (like X-acto). Surface tension will stop it from leaking if you don't move it, and bees can easily feed without drowning. I suggest you practice with water in the kitchen first to get a feel for how it works. Lots of people on this forum use baggie feeders like this, and love them. They are cheap, easy and don't drown bees or leak. When the bag is empty, just throw it away and put a new one in.