that water retaining gel is brilliant stuff, You can also get bits of kit to turn a plastic bottle into a slow watererer
http://www.amazon.co....-SPIKES/dp/B002SUNIQI
use a 500 ml bottle and shove it into the middle of the basket to keep it topped up. You can add very dilute plant food to the bottle too. Another good trick, if the basket is a basketty one and not one with a sloid base is to put a circle of plastic in the bottom to hold a small reservoir of water rather than letting it all drip straight out again.