I would follow your doctor’s recommendation for food intake on the day prior and use plain water for your enemas instead of Fleets. I found that the Fleets liquid really smarts, but not water, and it produced satisfactory results for me. Use plenty of lube when inserting.
I use one fleet enema followed by one enema w warm water. I too get burning w fleets. I've never had an issue and have had nunerous scopes all with very good visibility. No food or drink after midnite.
I found that two and sometimes 3 enemas did the job and the water does not have to be very warm. Once your output is reasonably clear, no more enemas are needed.
Some folks limit their diets to clear liquids the day before. This help keep the pouch from getting new "deposits" after the enemas. And yes, just tap water enemas, comfortably warm water.
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