I'm with Mark here!
don't go near them!! I used them once when i was younger and more foolish and they killed half my fish!!
Depending on whats in the tank i would just leave it. Most fish will survive fine for a few days without a feed. I would throw in a feed just as you walk out the door, just a normal one, nothing more, then feed them when you get back. I have done this to my amazon tank with discus several times and not a worry!
For fry i would get a big bit of cucumber and toss it in. I would go cucumber as if it is left in the tank longer than normal it wont foul the water as bad as anything else.
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