I made royal icing (egg whites, confec sugar, lemon juice) last Friday. I'll need it again next Friday and Saturday, but my recipe says it will keep for 5 days in the fridge. Will it still be good on Friday or should I freeze it? I've used it before when it was about 10 days old and it was runny and messy. Any advice? Rather not waste it...would it be good if frozen and then defrosted when I need it?
Thanks in advance!

No- keep it in a tightly sealed container with a damp cloth/paper towel and plastic wrap inside. Do not refrigerate or freeze it. This is the proper way to store it. Not sure if it will last that long. You might want to keep an eye on it to make sure no mold develops from the moisture.

you can freeze it I make big batches and freeze mine all the time

I also freeze mine with no problems, but I use meringue powder instead of egg whites. I make a full batch and then freeze it in 1 cup portions so that I don't have to unfreeze a lot when I only need a little.