For food, see if you can get a local mom & pop store/ pizza place to trade for a full screen 5 second card in the credits during the special thanks time. Find the price of a full page advertising from the local newspaper and throw that at them as cost comparison for what you're offering... you now (of course) have an obligation to be able to guarantee their ad will get in front of consumers, so you have to finish and have to screen it locally as much as possible.
Actors, get real actors, not just your friends.
Spend another year or two editing the script (yes, seriously - this is the weakest part of no-budget film as far as I'm concerned - and a GREAT script will allow alot of forgiveness on production weaknesses) with brutally honest feedback on it from folks who understand the language of film storytelling.
Get good audio equipment to use from somewhere/someone - get it done right... this is the second weakest part of no-budget stuff (mine included - we've fixed it now).
30-60 minutes lighting per setup (dimmers are cheap - get router speed controllers from harborfreight tools for $15 ea.). Set your key light, expose your camera to it correctly, then set your fill light on a dimmer and dial it until the image looks good, then turn on your back light (generally a little brighter than the key - so you can have the key on a dimmer as well to allow for this is you have 3 of the same lights). Take the time to use flags to control your light spilling on the background.
Use cool looking locations, colored walls, textured surfaces, nothing boring unless there's a specific reason to do so.
Don't overexpose your footage!
Keep it fun on set, but make sure you get what you need from your actors - even if it means extra takes. A single setup will take you about 1-2 hours with setup and tear down if you're cruising.
Or, use sunlight outdoors and block carefully (using reflectors to redirect the light onto your actors).