Ten days is quite long. I'd definitely plan a non-park day in there. Mind, there's plenty to do at WDW, it is more that we kind of need a break from WDW crowds after a while.
If you are a condo, you will most certainly want to scope out a good grocery store and plan a stop. I suppose if driving you can bring some stuff in the car, but we prefer to stop for perishables vs. using a cooler. On the high end, there's an awesome Whole Foods near SandLake Dr (lots of bonuses that most stores don't offer- like a hot buffet, brick over pizza). Mid-level is Publix, which offers quite a few quality prepared foods good for travelers. There are a number of Publix in the area. There's also several places like
Walmart, but they tend to offer big boxes of food. More than you need for a week, IMO.
You probably will do well - if eating out quite a bit - to eat a few meals off property. There's tons of options in the area. If you have a smart phone, it is easy to find options that way - complete with reviews. Your best days to eat off WDW are your arrival non-park, and departure days. Most days, eating lunch in the parks is best time-wise. Some MK days, we also hop over to one of the Disney resorts via monorail for a break and a snack.
We aren't into carrying bagged lunches with us. It is too much hassle to carry food around all day, especially in the heat.
In the parks, it pays to arrive early. It pays even more to stay late! The parks are best after dark. DO see the night fireworks and shows! They area all among the best ones WDW offers.
You don't need a huge elaborate plan to tour the parks, but it often pays to think a little outside the box. Zig when the crowd Zags. A simple trick - avoid the restaurants at noon. Eat lunch either a little early or a bit late. Similarly, at 9am, many guests go to the FIRST Epcot ride they see- Spaceship Earth. So you do well to simply keep your wits about you when touring. Know that the parks are most crowded from 11am to about 5pm, and plan accordingly. If you sleep in, and don't arrive at the parks until 11am- you'll arrive to the longest lines and greatest congestion.
My other big tip, don't freak out about weather reports before you go. Much of the year, WDW often gets short downbursts. DO consider inexpensive plastic ponchos (find in camping section of big box stores come spring). We also bring very compact rain jackets, and use those if the forecast calls for more extensive rain. DO have the guys wear cargo shorts. DO drink PLENTY of water every day! DO bring your smartphone. My suggestion is to avoid carrying around tons of stuff all day.
Driving to WDW is also lots of fun! Along the way, it pays to be quick, but it also pays to avoid too much fast food. With a little planning and a smartphone there are many great roadside options. Checking out different kinds of barbeque and regional foods is fun! When we drive, we often stop for a night in one of the cities/towns along the way. There are many inns with inexpensive rates and a decent breakfasts.