It would not hurt anything to take the drops during these two days. The point of eating the healthy fats is to store up on Omega 3’s to help counter the emotional and hormonal effects of the first phase of PS as the detox of sugar and chemicals can create feelings of withdrawals and sometimes anger. The Omega 3’s up front help with this. One thing you could do is go ahead and “start” Phase 1 with the foods you are supposed to eat, while also taking the drops and adding in the fats for the first couple days, even if this makes your calorie count higher then 1000.
Does that make sense? Let me know if you need further clarification.