Can I save my bamboo?

I left a friend to water my pot plants while I was abroad during the recent hot spell. I came home to find many of my beloved and prized plants dead or dying from lack of water. One in particular a Black Bamboo has lost most of it's leaves, just a few green ones clinging on. I've given it plenty of water, but so far no new shoots are appearing. Is there anything else I can do, or should I just give it up?