All the normal things that any woman having a baby would ( I think there's a list on here somewhere) plus your diabetes supplies - that is:
- insulin and delivery device along with spares (for me, that was my pump, spare cartridge, sets and cannulas and a back up insulin pen);
- meter and plenty of test strips;
- lots of glucose and Lucozade;
- snacks eg cereal bars, etc.
Take plenty of everything, like you might do if you were going on holiday. Be aware you won't know for sure how long you'll be in. I thought id be in 2 or 3 days but was in a week. Take plenty of glucose, including sweets or similar to have during labour, and plenty of snacks. After giving birth your insulin needs drop right down and it's common to have hypos. Also, if you're breastfeeding you may need extra carb snacks to top you up.
Good luck!