Coffee? Sure. That's highly perishable and may take too much time to brew if you're busy.
Packaged snacks? You might be the one getting eaten alive by paying inflated vending machine prices vs. buying in bulk and bringing snacks from home.
Spend: BofA PR + WWFCR, BBP, Schwab Platinum, CFF+CF, Costco, Discover Perks: IHG49, Hyatt75, Delta Platinum, "Old" SPG95 SD/AAoA Ballast: Arrival, CFU, DC Upgrade/downgrade games: BCE, EDP SUB: JetBlue, Amex Platinum Mostly earning MRs and cash back as I use up hotel and airline points spread across several programs.