Python 2, 95 71 70 bytes

lambda l,s:min(sum(s.count(c)for s in l)/s.count(c)for c in s if" "<c)

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Input: A list of strings as ingredients l, and a string as the meal s.
Output: Max number of meals that can be made.

How: Divides the frequency of each character in the ingredient by its corresponding character in the meal, then take the minimum.

Python 2, 95 71 70 55 bytes

lambda i,m:min(i.count(c)/m.count(c)for c in m if" "<c)

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Input: Ingredients i as a comma-separated string, and a meal m as a string.
Output: Max number of meals that can be made.

How: Divides the frequency of each character in the ingredient by its corresponding character in the meal, then takes the minimum.

Python 2, 95 71 70 bytes

lambda l,s:min(sum(s.count(c)for s in l)/s.count(c)for c in s if" "<c)

Try it online!

Input: A list of strings as ingredients l, and a string as the meal s.
Output: Max number of meals that can be made.

How: Divides the frequency of each character in the ingredient by its corresponding character in the meal, then take the minimum.

Python 2, 95 71 70 bytes

lambda l,s:min(sum(s.count(c)for s in l)/s.count(c)for c in s if" "<c)

Try it online!

Input: A list of strings as ingredients l, and a string as the meal s.
Output: Max number of meals that can be made.

How: Divides the frequency of each character in the ingredient by its corresponding character in the meal, then take the minimum.

Python 3, 95 71 bytes

lambda l,s:min(sum(x.count(c)for x in l)//s.count(c)for c in s if" "<c)

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Python 2, 95 71 70 bytes

lambda l,s:min(sum(s.count(c)for s in l)/s.count(c)for c in s if" "<c)

Try it online!

Input: A list of strings as ingredients l, and a string as the meal s.
Output: Max number of meals that can be made.

How: Divides the frequency of each character in the ingredient by its corresponding character in the meal, then take the minimum.