I guess get it with a label so you know (maybe!) what it is.
But 1,4-BDO tastes really bad, GHB tastes really bad but salty too. Also, if it's GHB you should be able to dry it out to a powder (that'll eventually turn back into a puddle by absorbing water from the air) by baking it in an oven for a while then taking it out and leaving to cool.