I like mark have used "normal" flower pots with holes cut in the side with a saw for some of the more ... adventurous plants like Equisetum , as it can be just as spreading as its terrestrial relative and have found the normal pots keep it more confined than the pond basket. It just breaks out through the many holes !
I repotted a number of the more lush plants this spring and am giving the new advice of just pure grit / gravel a go. Though as i recall from GW water lillies are still planted in the aquatic compost as they need a bit more substence to get their roots into.