I got thrush too, but fortunately a mild case that I was able to fight off.
I know getting in fluids is really hard early in (heck, it's still hard some days) but it's important enough to put all your creativity to work on it.
Do hot drinks go down better? Then tea, decaf, broth, sf hot chocolate, hot skim milk with vanilla and sweetener added, hot crystal light (sounds weird, but tastes better to me than cold) hot lemonade...
Do cold drinks go better? Then sf slurpies, sf snow cones, jello, sf Popsicles, half frozen dilute fruit juice, V8 juice, jugs of iced regular or herb tea kept in the fridge, iced decaf coffee, serve protein drinks over crushed ice...
Set a timer that rings every half hour and drink 2oz every time it rings...

Highest 303.4, Surgery 263, Current 192, Doctor's goal 180, My goal 165