I eat a bowl of 3 weetabix for breakfast, followed by some form of fruit, usually just an apple but a banana or pear do the job equally, then drink a fair amount of water in a short time, then sip water for about an hour afterwards, giving me time to pop to the bog. By this point im usually good to start my run, but on some mornings stiches just pop up anyway. If you find yourself getting one, slow your pace, relax your arms, and DON'T rub the area. A stitch is muscle contraction, inhale very deeply then exhale very hard to stretch the diaphram and surrounding muscles, and ease the stitch. It will probably be gone in half a mile.