How much feed do they need?

In the winter I would give them as much as they will eat.

 

Don't go to all of the trouble of breakfast, lunch and dinner. Just put a ton of food out and let them work their way through it. I use a 10 gallon feeder for four hens, and it takes them over a week to finish all the food. Whenever it starts to get low, I just top the feeder off. That way they're never left without food. (same thing for water)

Chickens aren't like dogs - they won't eat too much and get sick. They'll eat what they need and leave the rest, which is why free feeding (ie - food ALWAYS available) is a good idea.

 

Rather than try to remember to take food out on a regular basis, you might want to make yourself a "gravity" feeder (see my BYC page). Mine cost next to nothing as I got the bucket from the deli counter of my local grocery store for free, and got the base from the thrift store (it was a vegie tray). I screwed the base to the bucket and voila. The bucket holds 3 gallons so I only have to fill it up about once a week for my small flock. The feed dispenses out into the tray as it empties. You can also buy gravity feeders but they'll cost you a lot more and the concept is the same.

 

Since you only have 2, they don't eat too much, just fill up a feeder with feeds that will last them a few day. Not too much so it won't go bad. If you want to keep the rats away then pickup the feeder at night.