Jelly Drops are classified as confectionery and we are therefore not able to recommend a certain usage or dosage, but we'll do our best to guide you.
A drop contains 12.5 ml of water and they are intended to be used in addition to normal liquid intake. Usually, people start with just a few with each meal, to slowly build Jelly Drops into the routine. There's no right or wrong answer and as the drops are 95% water, low-kcal and non-laxative, many people end up eating a tray per day.
Please see here for the full ingredients and nutritional information.