Actually, we learn through our mistakes. As they grow, you will want to raise both the feed and water up, just not out of reach. It helps keep them clean. Good Luck, we have all been where you are right now.
try a rabbit water bottle..........in addition to the other one..........i only have 3 chicks and they use one..............with 15 you might try more........anyway, mine use it and love it and i have the peace of mind of knowing they always have fresh clean water.
As my chicks grow (they are 3 weeks now), I raised the waterer. First I put a 4"x4" piece of plywood underneath to raise it. Then I replaced the plywood with a scrap piece of 4"x4" 2x4. That lifted it enough above the shavings (the lip is still a hair lower than their neckline) that it stays pretty clean.
* My waterers for my grown hen are cut-down plastic bottles (empty vinegar bottles.). My goofy girl will ALWAYS climb the edge and try to roost on the bent plastic for the night. I have to move her to her real roost all the time. . . What is it with these birds and wanting to poop in their water???