The type of healer doesn't really matter with this comp, the strategy is largely the same. Strip the healer of as many buffs as you can at the start (unless it's a priest), so that you can purge the important hand buffs later on. Try to grounding totem if you think the paladin is going to throw a repentance or HoJ on you - telltale signs usually include avenging wrath, bloodlust, or trinket usage. Do not trinket an HoJ unless avenging wrath is up or their partner is assisting with DPS, because it will come up 40 seconds later. Since vindication no longer reduces stamina, there is now more leeway in recovering from a ret's burst. Living ice crystals/riptide is amazing for recovering from ret burst.

Do not bother purging the ret paladin unless it's at the very start of the game, as it is simply a complete waste of mana. No, don't even think about it.

As for actually trying to land a kill, you should be going for the healer until the ret paladin drops midway, then make a swap to the ret paladin to try to make him bubble. If he gets too careless after that, then swap to him and finish him off.

Drinking is not as high of a priority since you can for the most part water shield tank a ret paladin provided your gear is passable. That is not to say that you should ignore your mana - ret paladin games are often long and won through attrition if played right. That is not to say that you should expect long games, however, since there is always the chance that the stars align and you die before you could blink.

Expect to win more often than not (barring ridiculous ret RNG of course).