As it says in the title I have acquired a load of pure water 25litre empty containers. I personally use them round the birds daily and for camping also. I have sold many off these to the equine world as well. Apparently if you fill them with sand they make perfect pole holders for jumps as they lock together when stacked. They are extremely tough and long lasting and need no rinsing before use. The more you buy the cheaper they get. £3 per container and preferably collection from Hampshire unless you want to organise a courier.
I will try and post a pic if I can work out how to. Cheers Rob.