title_body: Brew a less acidic coffee
upvoted_answer: You can try switching to cold brew coffee which is reportedly 67% less acidic than regular brewed coffee. 
  
  Regarding the caffeine amount, Wikipedia notes:
  
  
    Although less caffeine is extracted with the cold brew method, a higher coffee-to-water ratio is often used, between 2 and 2 1/2 times. This may compensate for this difference in solubility, resulting in a brew with equal, if not more, caffeine (although this is unlikely)
  
  
  Additionally, despite the name, cold brew coffee can be enjoyed hot as well. Cold brew is essentially a coffee concentrate if steeped long enough. You can cut your cold brew with boiling water and serve it hot (Source), so you don't need to necessarily change the way you enjoy your coffee (if you enjoy it hot). 
  
  Hope this is helpful!