E. coli live in your very own gut. You cannot get away from bacteria, but you CAN and should use good sense: wash food before preparing it and especially if it is to be eaten raw, cook food well, don't depend upon the manufacturer/grower when they say stuff is "pre-washed in pure spring water" (ever hear of giardia?), and so on. If you do come down with something know when to see a physician.

One thing you can do if you do come down with it is to keep your electrolytes up. In the US we have things like Pedilyte (for children, but works for adults) and Gatorade (in various puke-inducing flavors) which can help. But if it's serious, see a doctor!