Bathing!

Okay, so I have been bathing my son in the sink and I'm thinking we should start to think of what to use next, when he starts sitting up on his own I'd like to try a different bathing situation as my sink isn't deep enough to contain the splashing around.. I only have a shower. So what have you all done as far as bathing your LO without an actual bath tub? He is almost 6 months.