day 1 we used water with electrolytes and probiotic and the 6 chicks are still drinking this from a water feeder that they pick at day 2 they are still drinking the small dispenser of mix. don't want to throw it away. can we keep the gallon container we mix and give it to them later. I know we are suppose to switch to plain water soon. what do we do with the old mix not used and when do we introduce just plain water?