Hello! Welcome to Beyond Soy!
We always recommend reading the ingredient list of every food you purchase in the grocery store because soy can be present even where you don't expect it. It's easy to think to check items that are likely to contain soy (i.e., pre-processed food, breaded food, fried food, etc.), but some foods that you wouldn't expect also contains soy. Over the last few years we've found these foods by reading through ingredient lists; and sometimes we've been very surprised by what types of things contain soy.
One of the oddest soy-containing foods we've found is lemonade. Some lemonade contains natural flavors (which we tend to avoid because we can't really know if they contain soy or not) and powdered lemonade often contains soy in the form of soy lecithin. As a result, we typically avoid lemonade when we can't be certain that it wasn't made from a powered mix.
At home, we make our own lemonade. Instead of laboring to collect lemon juice and add sugar, we use MiO Lemonade Liquid Water Enhancer. It works just the same as a powdered mixture, but contains no soy! It works great for both individual glasses of lemonade as well as full pitchers.
Lemonade is a great example of why it is important to check ingredient lists. Even if you find soy unexpectedly on an ingredient list, there is almost always a workaround to create a soy-free option.