if you are playing in a tournament, you need to abide by tournament rules or however the tournament director wants to play them because they have ultimate power at tournaments...vast majority will follow standard rule set
http://www.table-soccer.org/rules/documents/ITSFRulesEnglish.pdfspecific rules for time between are as stated in the Delay of game rule but in practical terms, if you randomly grabbed for a drink of water or something in between as long as you weren’t milking it, no one is likely to say anything…now if you take your time and do it after every ball that is another thing and that is why the rule is written
BAR RULES (fun time BAR RULES) are another thing, especially when it comes to time outs...you have to have an agreement with the people you are playing with or rules adopted by that bar location or it could get ugly...
we play the "one sip rule" (thanks Bill) between balls or ball off the tables, any or all players can take "one sip" of their drink without it counting as an "official" time out...time between games is sort of negotiable...depends on who needs a drink or to go to the bathroom...we try and get people to do this when they are not up to play next but hey, some times, when you are “having fun” what are you going to do?
With that said, under normal “One Sip” rules, you should know you can have 2 or 3 sips between games
there are of course exceptions, some have been mentioned, others are location specific...like we have pool playes too close so some times there is the pool cue in the butt time out which also doesn't count and the table is quite close to other tables and when the place is busy, sometimes we have play stoppage times outs for "crowding"