How to make your own chia seed drink recipe. 1  Warm your water, put in a cup and add your 3 TB of chia seeds. 2  Stir well till the chia seeds are evenly dispersed and start to swell. 3  Cover and put cup in the refrigerator. 4  Let sit overnight. tablespoon of chia seeds weighs only about 0.4 oz (not 1 oz). So 3 tbsp weighs only 1.2 oz and costs only about $0.53, not $1.31. Ingredients sum to $1.65, or about 5 cents/oz. And, there are many good juices that are cheaper than your example, lowering the cost even further.