I've had a similar experience with these things. I gave one to my goldfish before I left on holiday and asked my boyfriend at the time to check on them anyway. They had scoffed the 1 week feeder in 3 days. He eventually just had to come by every few days to feed them and monitor their behaviour for me.
As to what you should do. I would recommend buying an extra set and put them in NOW to see if they eat it. Don't feed them regularly just see if they go for the feeders. If they do then you're golden, if not then you may just have to take them along, whether in the 1 gal or the 10s. It will be difficult to heat the 1 gals though...as well as you'd have to change the water everyday.
Just as a warning though, some people have really bad experiences with these things, i.e. clouding up REALLY badly, coming home to sick fish, etc.