Hi,
Thanks for your responses. Ive got hold of some flexible tubing, which should fit over the "drain pipe" leading out of the air con, so I can funnel the water into a drinking basin, and put it in the shade also.

I suppose, bearing in mind that the only other source of water they will have in summer is the run-off from the sprinklers (which is slightly de-salinated sea water) then the water from my air-con will be a good alternative. The other advantage is that there will be a steady supply all day, so hopefully it will not totally evaporate. Then on the weekends I can give the basin good scrub and clean.

It just gets SO hot here in summer, and I feel SO sorry for the strays - it must be terrible for them to be hnugry and thirsty, and them come accross big bowls of dry cat food, but no water!

So hopefully we now have a solution!