So let's do that. You'll need to maintain a savings account large enough to cover expenses in the months that have no income. You know your business. You'll need a savings account that equals your expenses during that time. Since you have a plan you'll be able to estimate those expenses with some accuracy.
Some people keep the savings in their regular checking account.
Others use a separate account. Whatever will work for you is fine. Just remember that when you do get that 'windfall' check you must replenish the account for the next dry spell. Then it's going to be harder. You'll be using borrowed money, probably credit cards, to cover the lean months.