Phal watering ??

[tedbib]

Being new to orchids I have a question ..

I usually have to go away for four weeks --once a year.
Does anyone have any ideas I can use for watering my Phals while I'm away ,other than asking a neighbour to do it for me,which I don't really want to do

Is a month too long to leave them with out water?
Could I give them a good watering before I go and maybe stand them in a tray of pebbles /water with the bottom of the pot just out of the water ?

I look forward to your replies
Thanks

Eddie