.... No matter how tough one may think one is, its always mindful to apply some common sense. Some useful rule of thumb i apply to manage risk are;
* Always stick to bottle/canned water/drinks for hydration
* Don't drink with Ice in a cup, use chilled bottled drinks if u want cold. And drink direct from bottle w a straw if u don't want to look so "macho". Yes rats, lizards & other pets do run on canned/bottle drinks for their IPPT training circuit & poop on it.
* Don't buy food that you see that has no customer traffic or little customer traffic ie the food has been sitting there for long time. Bacteria has set-in and started to have their orgy already. When picking food, always go with the local crowd mentality, ie.e go to the stalls that the locals go to. Locals knows best.
* Make sure you eat fully cooked/microwave/grilled meat food i.e make sure they reheat it up again even its already cooked before. For Nasi Padang in Indo, i know the food are left on the shelves. Make sure there are nets covering the shelves & food.
* Don't take any un-bottled sauces or gravies, if you are worried. If it don't taste good w/o gravy e.g. satay, then just take lesser loh.
* Finally, common sense. Although some say common sense is not so common, so maybe refer to Nono's recently listed a few threads ago (#30534) "guildline on how to pick the almost 'right' girl".

Also the personal hygiene of the kitchen staff(s), no matter whether u eat at cafe or street stalls, its will be a "lucky" draw for the unlucky stomach.
* Lastly, if all things failed, bring & take charcoal pills or Po Chai pills (for those old timers will know this item) and drink a lot of bottled water.
Disclaimer: i am no Bear Grylis of street food expert. I have my own minor diarrhea episodes too. I just take it as colon cleansing loh and drink lots of bottled water. Lastly,
One Man's Food is Another Man's Poison, literally!!!
p.s some hotels or restaurant may claim to have water filtration system. But if they don't regularly maintain it or change the filters also no use.
Maybe some bros can add to the do's and don'ts of eating outside.
Just Noted: Nono's new food places and listing. Pictures of food looks so tempting and yummy and safer i guess.