A warm, sunny day will make you have a red and blotchy appearance. Particularly when you are dehydrated and otherwise possess a pale skin complexion.
Further, coke generally possesses little to no nutritional value and does not serve to quench thirst. You do not see people on a marathon grabbing bottles of coke from bystanders as they run.
Gatorade or water, ah... now then that'd be different.
Hydrate yourself, wear sunblock, wear weather appropriate clothing, and move on with life.