Toddler has diarrhea

My daughter has randomly gotten diarrhea out of nowhere I’ve already changed about 3 pampers in the last hour and she’s currently pooping again . I know to keep her hydrated she drinks ton of water constantly . She doesn’t have a fever she did have mucus the past couple of days which seems to be gone now . Is their anything I can give her for an upset stomach she’ll be 2 in January . Her dr isn’t open all weekend so calling them is out of the question . Just looking for some advice