Add to the above a pair of waterproof socks for when the wet gets in.
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I have some with Gore-Tex or similar that seem to work, but then my boots have GoreTex themselves so maybe not doing much or anything.
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There are some available - no experience - that claim to keep your feet dry even standing in a bowl of water. IIRC Aldi had them recently.
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Go search. I suggest you start with outdoor kit suppliers.
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Also have spare socks sitting on the radiator at work waiting for you to arrive!
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Until you find socks, howzabout a plastic bag over your sock?
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ADD:- see
here for Aldi item back in September. - and search for Dexshell waterproof socks in Google