Thanks you very muchKeep lights out on your tank and they will likely be fine. Or get well reviewed auto feeder and set it for the lowest possible amount. Do not use feeder blocks, they are not a controlled release and will in all likelihood foul your water and cause issues.
If I had no one to feed a couple times while I was away I would lights out and go. Do a large water change before I left and a large one when I returned. Feed lightly the first few days I was back. I used to leave tanks 5-7 days regularly and never worried about feeding. I've been gone 9-11 without feeding and everyone survived. 14 days I wouldn't like it but realistically if they are healthy they should be alright. And they are guppies so I would assume their fry are going to be a nice snack while you're away and I personally in that case would again not worry. I just leave lights out and ambient room lighting to keep them on a day night schedule and they should be perfectly fine.
That's exactly how I feel about auto feeders and I don't use them myself... I just go do what I am doing and let the fish be its always worked out fine.I wouldn't even use an auto feeder they can malfunction and overfeed your tank. Since you can't do water changes, you don't want waste to build up in the tank either.
Just an update, we got back today and all of my fish were dead, but there was one baby in the tank that is doing fine. I don't know what happened exactly but here's what I think happened... For one the feeder block did not work at all. A relative came to check on the house about a week ago and said my fish were doing fine, so I think that right after that a fish had her babies. Then I can tell that most of them were eaten when the adults were still alive because there were no dead fry on the floor. Then, for reasons unknown all of the fish died, leaving one surviving fry, they all look like they died about a week ago... Cause of death: unknown