You can use a singular verb if you're thinking of the compound subject as a unit. That's not a problem. Anyway, in this case, it's not really two subjects connected by 'and'.
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twistedthistlein fact, Oxford has an example under "cold": "Hot and cold food is available in the cafeteria."Go with Oxford—you can't lose.
twistedthistleCan anyone shed any light on this for me?I attribute it to the fact that 'food' and 'water' are uncountable. Hot and cold foods/sandwiches are available.