People here - very kind - are mentioning juice. Not a thing I keep in. What kind of juice are you thinking about? We have lots of orange juice as well as mango juice and some others. Should they contain sugar? Eating is a problem but drinking juice would be more than OK as my mouth is very dry and I am drinking lots of water. I would have to bolus for the juice if it contains a lot of sugar - right?
Fresh fruit juice would be best and yes you'd need to bolus for it because all fruit juice that I know about would contain carbs. The carton will tell you.
Your big risk right now is ketones leading to potential DKA and this needs urgent attention.