They need a water bottle, the kind designed for rodents w/ ball bearings in the sipping tube- not a bowl, as you've found out. Or at the very least, some romaine lettuce & moist bread, something like that. It's cruel to leave them so long without food & water, even if "they're only feeders".
How would you attach a rodent bottle to a cardboard box?
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"I'd rather be hated for who I am, than loved for who I am not" -Kurt Cobain