I've found in the immediate aftermath of the operation that I forget to maintain the routine of drinking little but often.
To help keep myself in tune with my body, and not find myself trying to drink as much as I did prior to the op, I found making a weekly chart up with my routine was very helpful.
On the left hand side are the times and amounts of drinks/meals... e,g,
08:00 a.m. 250 ml water
09:00 a.m. 250 ml ‘nutrition supplement’ (i.e. Optifast etc)
10:00 a.m. 125ml fruit juice
11:00 a.m. 250 ml tea/coffee/herbal tea
12;00 noon 250 ml thinned lumpless tomato soup
01:00 p.m. 250 ml nutrition supplement
02:00 p.m. 250 ml diet cordial
03:00 p.m. 250 ml tea/coffee/herbal tea
04:00 p.m. 250 ml water
05:00 p.m. 125 ml drinking yoghurt
06:00 p.m. 250 ml nutrition supplement
07:00 p.m. water or ‘diet’ hot chocolate drink
... and then each hour tick off what you've eaten or drunk.
Sounds simple, maybe silly, but if you keep up your hydration and nuttrition to the plan then there is less liklihood of getting overly hungry or thirsty and causing yourself problems trying to force large amounts of food or liquid into a tiny space!