Water intake

FTM- 19 weeks. My doctor said I need to be drinking between 80-100oz of water per day. I’m finding it really hard to do. Does anyone have any tips?

Some more background- I called my doctor’s office a couple weeks ago because I was having headaches that would go away with Tylenol but come back. They said that I haven’t been drinking enough water and wouldn’t be concerned about it being pregnancy related until 20+ weeks. Plus I don’t have any other preeclampsia symptoms at the moment.