Hi guys, this is probably a stupid question, but if I have these 8 oz pet bottles and I want to fill them with lotion, and put 8 fl oz on the label, do I have to fill them to the very top? If so, what about if I need to put a pump in it...that would then displace some of the lotion (as much as a tablespoon, probably) and then it wouldn't really be 8 oz, anymore, would it? So, then if I use a pump, I'd have to label it as 7.5 fl oz, or what? I notice all the commercial lotion I see goes by fl oz versus just oz.
Thanks for any light y'all can shine on this for me!