Eva888:
It was boiled cooled water that I poured into the jug. No sugar at all.
We had our first ant invasion for quite a while the other day - they were also after the boiled water in a jug that was cooling on the bench overnight.
Kitchen was spotless and they hadn't swarmed the rest of the kitchen - just the jug and surrounding area.
Tiny little black ants that were hard to see on the speckly faux-stone bench.