Quick bite places in Studios:
Mel's drive in (fun 50s style diner with classic cars out front...food is generic burgers/chicken/fries...hand-dipped milkshakes are great)
Monster Cafe (old school monster movie theme...I don't remember any of the food there except a rotissere chicken platter...allergies in my family, so we skip some places)
Leaky Cauldron (great decor, if you are into HP...food is decent/QS park food, menu is more English pub-style...bangers and mash/toad in the hole/etc)
Simpsons (all under one roof and one line that goes past all choices...Krusty burgers, Cleetus's chicken, Lisa's salads, etc) Pricier than other QS places, it gets VERY busy, so I would go at an "off-time" if you want to eat there.
Bumblebee Man Taco Truck (haven't eaten there, haven't heard very good reviews, and the allergies have kept us away)
Maybe more, but I'm going off the top of my head.
Without EP (since you said you wouldn't have it) I would go on Despicable Me first (it can have one of the longest lines), check if you can get a call-back time for Fallon, then I'd go to Gringott's Escape ride. After that, I'd do Shrek (it can get long lines as well. Check the map or swing by Terminator to see what time that show is running (it can be fairly long though with all the pre-show rooms & then the full show...to each their own, but I prefer the Monster Make-Up show
)
Fear Factor also has set show times, so that will be a factor in when to be over there.
IMO, you could add in the Simpsons, ET, Transformers, Kang & Kodos in wherever they fit best in your day.
Not sure without EP you can do all these before 4:30 on a busy Saturday, so IMO do the most important ones first, and use the Single Rider lines when available.