Friend got me a pet fish as a surprise gift, but I have no clue how to care for it. See below details. Would it be messed up to return the fish?

So the fish is still in its pet store container I haven't removed it from there since I'm preparing the tank. Anyways for the tank I used purified /distilled water. Plan to let the water settle in tank 48hrs before transferring fish. I did some digging and found out this type of water isn't for fish. So I have to start all over, clean the tank , and use regular sink tap water and with that you have to check the ph. This is a bit much for me. There are so many specifics and tedious things to know about a fish. And it can't stay in the store container too long yet I still have to redo the tank
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Thanks @laly520 for the advice I'm going to keep the fish and just purchase actual fish water from petsmart or walmart.
Friend got me a pet fish as a surprise gift, but I have no clue how to care for it. See below details. Would it be messed up to return the fish?
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