How much water weight is expected via the TDEE method

So far I have gained albs when switching from the 1200 calories+1/2 exercise calories (for 2.5 months) to TDEE-20%. I was on my last 11 pounds (now 13) and I have gained 3-4 pounds back..but I have been staying under my TDEE (Above my BMR) and hitting my macros. I have been on this method for almost a month now.

I am thinking this is waster weight...how much more am I going to gain and when will it subside?

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