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The best bet is the water moat method. Place a smaller bowl inside a larger one and fill the gap with water. You could also try sprinkling diatomaceous earth (100% DE with no added silicon) and scatter it around the food bowls. This is microscopically sharp and ants dislike walking on it. (You may find it in a store that sells to poultry keepers, as its a popular no-chemical way of keeping mites at bay.)
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