The form "help you save money" is correct if the subject is plural.
If your sentence has a plural subject, then it has a compound subject made up of two nouns, both gerunds:
- Living [at home]
- Enjoying [your mother’s cooking]
The verb to help conjugates as help in the third personal plural. The following elided sentence has the correct form, which matches your original: Living...and...enjoying...help you save money.
On the other hand, if enjoying your mother's cooking is not part of a compound subject, but instead is subordinate to Living at home then the subject of the sentence is the single gerund Living. If that is the case, the idea might have been (better) expressed as Living at home—and enjoying your mother's cooking—helps you save money.
There's also the question of the meaning of the verb to enjoy in enjoying your mother's food. In this context, the gerund might be a synonym for consuming or eating just as well as it might signify relishing or fancying. One might prefer one's mother's food, and yet not eat any of it. Maybe I love cigarettes, but I never smoke.
Since to enjoy one's mother's cooking does not inherently save one any money (which would be the case if you love your mother's cooking yet you live far away from where she lives), a strong argument for the sentence having a compound (plural) subject could be made on the basis of its semantics. Merely living at home would save you money, but if you live at home and love your mother's cooking, you will save even more money. If we're talking about maximum money saving, then we're going with the plural subject.
Forty years ago, a subordinate clause would have been set off by commas, as in: Living at home, and enjoying your mother's cooking, helps you save money. But now we disdain to use such orthography, and so we pay the price of increased ambiguity.
The efficacy of your sentence—as well as the reliability of our assessment of the idea it was intended to convey—may have been diluted to naught, due to the current state of the written tongue's stylistic evolution.