If you just transplanted, this is a symptom of transplant shock, it will come good in a day or three.
Otherwise, 0.7 litres of water is barely enough for a plant this size, more liike 2-3 litres at a time.
I hope you drilled holes in the bucket for drainage, otherwise this could also be a symptom of drowning.
Take your pick of which answer suits what you have been doing!
Cheers, Organoman.