Water Cups/Nipples

I don't have a water supply to the field near my cottage where I keep the chickens so I have been looking at various options. I collect rainwater from the shed on the field into a large water butt and I have a couple of large water storage containers.  I use the traditional poultry water drinkers but I am constantly having to fill them, they get dirty and knocked over as well. Has anyone any advice re using Drinker cups or nipples fitted to water storage?  There is also a universal nipple type  fitting that fits to any large type plastic bottle (i.e coke/lemonade).  I also found a great site called Royal Rooster which has cups and a great set of drinker/feeder tubes  but it is based in Australia so the postage costs aren't probably worth it though the set is very reasonably priced I think. (someone should get the UK license   )

I found that our birds just ignored the nipple type drinkers (but they are spoiled brats!). The solution we've taken is a drinker, from Charlies but I'm sure commonly available, which hangs by a string. The valve at the top is controlled by a spring. Water from a higher level container (bucket, tub, etc) goes to the valve, down the sides to the drinking bowl. The weight increases pulling down and compressing the spring. As the spring is compressed the valve shuts. As birds drink, the bowl lightens and more water is admitted. Works really well.

Having tried various types of water container I settled on small 3 to 5 litre buckets. They did not get knocked over stayed clean and it was easy to get the ice out in winter. They were easy to clean  as well - the traditional chook waterers are a nightmare. I used buckets that horse feed supplement came in so they did not cost me anything and I was recycling. I wouldn't use anything else.