^ Wot Kim said. Can use squash or diluted fruit juice with a pinch of salt (if you can face it) if no Dioralyte.
Could be Norovirus (important controls are handwashing with soap, separate towels, disinfect common points of hand contact (like basins, door handles, etc.). Horrible but usually short-lived (apart from feeling knackered for some days).
Could be Bacillus cereus intoxication from the batter, depending on how it was kept after making. Several toxins involved, emetic & diarrhoeal, some quite heat-resistant so could survive frying.
Staph aureus intoxication also possible (similar to above). Who gets what is sometimes difficult to rationalise, & is something that makes sorting out the cause of outbreaks rather tricky sometimes.
Hope you GWS & offspring remain healthy & rude.
