Hi,
Are your BG's high aswell?
Are you taking insulin as normal? background and with meals? Water will help flush ketones out, but without sufficient insulin in your system they will keep being produced so water alone will NOT get rid of ketones.
If you are taking your insulin check it's in date and if in doubt throw it out, try a new pen or vial, try a new one from the fridge. If your using insulin that has lost its potency then this is likely to be the cause so using fresh insulin is always a good idea.
3 days is a very long time to have ketones, i know you don't want to go to A&E but you need to sort this out ASAP. ketones are nothing but bad news.
I don't mean to be harsh but if you don't get it sorted you will either have to go to A&E willingly or in an ambulance, i know which one i would prefer.
Please don't let them climb high and if you see no improvement then please seek medical help.
We all know it's a pain and i myself have put of going to A&E for many reasons in the past and it did me no good and i just ended up worse off.
Either way i hope you sort it out and get rid of those awful awful ketones.
Take care x