Ooops, that sucks! Those things aren't cheap. I killed one a few years ago doing the same, and I my current one leaks now because of making these things. I guess anything from a reputable brand would be a good bet, anything upwards of $400 or so. I don't know if good ones can be had cheaply, which is sad, because I don't want to spend that much on a kitchen gadget. It seems like there is a real jump in quality with these things once you break past the $100 barrier and shell out more for them. Kenwood I think is meant to be good
You could definitely take them on a 5 - 6 day trip, especially if it is in a cool climate. If left in the sun they might go a bit mushy, but they should be fine as long as you only add a bit of coconut oil. Just keep them wrapped in grease proof oven paper. If you are really worried I can recommend the Big Sky food cozy that the friendly guy at Backpacking Light (thankfully) talked me into buying. A nice little insulated bag for rehydratable meals also doubles as a cooler bag.
I found the biggest problem with these kind of homemade bars was not eating them all before a trip