Not to steal pbbth’s thunder… 
We were told that the rules, the procedures, whatever, were entirely up to us. Someone could volunteer to be foreman, or we could vote – hands or secret ballot, but even making the rules about how to enforce the rules was something we would have to tackle ourselves with no help from outside. In my case, several jurors knew me (it’s a small town), so I volunteered and they voted me in by concensus.
The deputy parked herself outside the door in case we had any requests, all of which had to be taken first to the judge in a written note (except for food). The judge answered simple legal procedure questions with a written return note, but anything more complicated required reconvening the courtroom where all members were present. We did that twice in a 2-day trial.
We were not allowed to make phone calls, but the deputy would take requests to let family members know important stuff, like would we be coming home for dinner or not and relay the messages.
It was obviously verbotten to have laptops or other communication or research devices in the jury room and we were cautioned not to google for anything relevant during the one night we went home before the trial ended.
It was up to us, the jury, what we did for lunch, but we couldn’t leave the jury room. We had several takeout menus given to us and the deputy would take any orders and pick up any food we wanted (there might have been a price cap, but we didn’t try to push it). We were offered a menu from the jail’s kitchen, and most of us thought their food was the best – really – chef’s salads, hamburgers, soups. We had a smorgasboard of bottled drinks, coffee, and snacky foods laid out for us twice a day, and if we wanted something different, they would get it for us.
Oddly enough, if anyone had wanted to set up an elaborate signalling system to the outside, since we had a big window to the parking lot, it would have been possible.