I had to eventually seperate my female from the male. As every month or so... eggs would appear. And now that I have seperated her, I realise how stressed she was in the tank with the male. She is much more active and out and about now that she is by herself - I feel quiet guilty that I let her stay with the male for awhile.
When I go away on holiday, my poor mum feeds my babies and axolotls! Full grown can easily last 4 days without food though - obviously not the preferred option.
You can always put a small goldfish or two in your tank whilst you go away. Some people I know are against putting fish in with axolotls, but mine always go crazy and gobble them up quick, then dont eat for about 2-3 days.