Down payment percentage for investment property vs second home

[Cheryl Hewitt]

I'm interested in purchasing a vacation home (second home) that will be for our use, but also short-term rental when we are not occupying it ourselves. The property is 88 miles from my home. I estimate that we'll occupy it between 14-30 days per year. 

I am getting mixed information on different sites as to whether this would need to be financed as an investment property rather than a second home.

What percentage should I expect to put down? 

Will I need to have reserves to cover 5-6 months of payments? 

TIA