You could bring a wireless router and make your own wifi hotspot in your room.
Either way, try it out at home before you get to WDW.
Sometimes you need to be online to finish an install or update.
WiFi is available in the lobby and pool area for $9.95 per 24 hour period.
Bill
Another option: if your phone is capable of wifi tethering (many newer ones are) you can go that route. I switched over to that model, and it's very convenient, as long as you can get a signal.