With the bottles and caps, I'd just do an ethanol rinse, then let them dry. If you have a pressure cooker, they double as an autoclave. You could put the media bottle, with cap on, in there and do a 15psi for 15min run. You only really need to do 250 degree in the oven for about 20min. That allows 5 min for the bottles to come up to temp and 15 min for the heat do to it's killing thing. At that temperature, if we are talking about standard media bottle lids, if they can handle being autoclaved, they can handle a dry heat run at the same temperature. If you are talking about what I posted a pic of below, standard GL45 caps, autoclaving and dry heat sterilization runs would be fine. These media bottles were designed for use with brewing and sterilizing cell culture media in mind.
For example, the hybex brand GL45 caps that medlabsupply sells, standard caps are good to 140c(284F) and the red hi-temp caps are good to 180c(356F). So either one would do in a standard autoclave(250F). What brand are you using?
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