I also had trouble drinking water in the past. I just didn't care for water unless I was really thirsty, only I did not get all that thirsty for water. I also suffered from Irritable bowel syndrome badly.
I found that if I take a glass jar (like from a jelly or a jam product and clean it thoroughly, I can fill it with ordinary tap water but I must place the glass of water in the refrigerator (not the freezer). For some reason I love the water cold? Then I can drink it like crazy! But remember that the cold water can give you a sore throat so allow the refrigerated water out of the refrigerator before drinking it for awhile so that the water is not too cold, it will still be cold enough to drink and enjoy. Now that I drink refrigerated water, my irritable bowel syndrome isn't bothering me anymore!
Just letting others know what works for me with drinking plenty of water.