Most Homeopathic HCG's do not have to be taken at a specific time in correlation with meals as long as it is 15-30 minutes away from eating, drinking, smoking, brushing your teeth, etc. as it could interfere with the absorption of the HCG.
As with any remedy or medication, the HCG diet drop doses should be spread out evenly throughout the day to keep the HCG going through your system for best results on the HCG diet. For example, 8 am, 2 pm, and 8 pm are good evenly spaced times to take them at. 7am , 4pm, and 7pm works fine too. Just keep it spread out.