The reason you use an air pump when brewing teas is to oxidize the water to a point that the micro-organisms in the compost materials are able to thrive and multiply. Without the bubbles, there is no oxygen, and the bacteria and fungi suffocate/drown. Stirring the tea once a day won't do much, and you will have an anaerobic tea. You can still make teas with nutritional value this way, but there will not be any active beneficial micros in your tea. I wouldn't recommend putting compost or ewc in water and letting it sit and then adding that to my soil, I feel a lot of bad guys would live well in anaerobically decomposing organic matter. But I have seen many grower's soak things like blood meal, bone meal, kelp meal, and guano, and use these "teas" to water their plants with no negative side effects.