I use old plastic dustbins which became plentiful when the council delivered Wheelie bins. I keep the lids on them though. It is quicker to dip the watering can in to fill it than to run a tap from a water butt.
Any container will do, even with holes in because you can line it with tough polythene sacks used for gardening or rubble. Your local rubbish tip may well have something you could use, it is the ultimate in recycling! Collecting from a tip!