Effortless, groceries were waiting for us when we checked into our accommodation.
Best way to get stuff to your room at WDW, all I had to do was tip the bell boy. I got water, beer, diapers and snacks all with no hassle and decent prices. Meet a man on one of the WDW buses who was carrying a $30 case of water, he was bragging that at $3.50 per bottle in the parks he was saving $$. I told him about Garden Grocer, but didn't have the heart to tell him I paid $8 for a case of water (delivered).
All items ordered were delivered promptly.