Potable water at truck stops??

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I’m looking for my daughter/son in law for a truck stop that has potable water, somewhere between Waterford Michigan and Norwalk Ohio.

So you understand, he is pulling what is tantamount to a semi trailer...ok it’s a semi but the trailer behind it is for his race car, and it’s just as big as a normal semi.

The issue is they can’t find a place to stop for potable water. Unfortunately they have filled their tank with non-potable stuff and have added some bleach, but I have advised against using this water for much more than the toilet and hand washing. They want to shower and stuff but she is nervous about it all.

So any way to get real water into the tank? We though about pulling it up to the house but where we live isn’t conducive to big semis.

Any help is appreciated!