Plan to get a HELOC, but wondering if getting a HELOC would affect our ability to get new mortgage for next house?

My question to anyone with experience is, Is this a normal term for a HELOC or are there banks that will allow me to pay nothing unless I'm using the HELOC? 

I AM exploring an offer to re-fi at a lower rate, which could drop the mortgage about $250-300/month.Now the crux of the question: if I want to get at the equity of the home to use for a down-payment on another investment property, I know there are basically three options: HELOC, cash-out re-fi, or sell. 

Does anyone have any recommendations for a great bank or credit union that offers competitive HELOC terms in Myrtle Beach, South Carolina (or Horry County overall)?

Using a home equity loan or a HELOC, can we use that money to pay the partner off and also use that equity as a downpayment for a property?

She was looking to sell it As-Is but she recently found out that her dad took out a 2nd mortgage that has about $30,000 left on it and a HELOC which left the house with no equity. 

I was fortunate enough to have in-laws that are very financially savvy and clearly understand what I'm doing, so they graciously offered to pull out HELOC money on their primary residence that they own mortgage free, to help the me and the wife acquisition and rehab our first rental.

@Viron Hale cold hard cash, cash from a refi or Heloc, private lender, HML, bank loan, seller financing 

Also, if you get the equity out by a HELOC, you still may not be able to take the deduction because the funds are required to be used to improve your home to be allowable to deduct. 

I want to buy another rental should I do a Heloc at 90/95% or refi at 80?