I am envisioning my shiny new bolts popping out one by one.

I agree with having auto-spec bolts but also agree that water pump attachment is a non-critical application. I would not, however, not use Home Depot bolts to replace the pulley bolts.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black