going on vacation, any tips on watering for phalaenopsis?

[annmac]

Hi
I'm going on vacation for 2 weeks and am looking for ideas on providing my 4 phalaenopsis with adequate water whilst away. I live in the middle east where it is currently summer and we have the A/C's on 24/7. The room temp is fairly steady 74 - 76 degrees but humidity only around 20 - 25%. Usually I mist them first thing in the morning and regularly top up the humidity tray.
I was considering buying an aquarium tank and standing them in this on the humidity tray in the hope to at least provide a more humid environment for them.
I do have a person who could come in once a week to water them but they need more than this due to our dry climate.
Any thoughts or tips gratefully recieved.