Hungry wainscot

This striped wainscot was trapped in a plastic beaker for keeping a while when I noticed it immediately start to feed on some liquid inside: either lager or orange juice!  I removed it and dropped down a blob of best Ceredigion honey which it avidly consumed.  Afterwards it searched around down the holes in the pad and drank another blob I provided.  I considered it had enough rocket fuel and removed it; the paper was bone dry and clean.
I suppose someone knows how often moths need to feed (if at all) and I am minded that the mammalogists have to provide food when trapping high octane species like shrews or they die!