One who is aware of this could check up to 10 drinks for their friends. Through effectiveness, that one might be able to convince others. Everything starts with a few who convince others.
Look at Google, for example. It used to be a nerd-only thing (I remember a time before Google was). Now, I can't think of anyone who doesn't understand when someone says "just google it".
But, really, if you want to educate people, teach them to drink only from a bottle and to keep their thumb over the neck when they aren't drinking it. Alternatively, convince them that if they ever take their eyes off of their drink, even for a second, and there are other people within arm's reach, just leave the drink and hit the dance floor for a while then get a new drink.
The only "safe" way to drink open drinks (cocktails/hiballs) is to drink them all in one go over a period of five or ten or fifteen minutes without putting down the drink, then do something else for a while, like dance or get some fresh air or hit the washroom, or just have a conversation with someone. If you're concerned about getting too drunk, a good bartender will not judge anyone, especially women, for ordering water, and if the bartender does give the person a hard time about it, that person should never return to that bartender.
Obviously, the safest way is to not go to the bar, but no one will listen to that advice, so if they're going to go out, they should be well-informed with good advice.