9 month old won’t drink formula

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So I did call my sons pediatrician, and I’m waiting for a call back, but in the meantime I figured I’d ask here

My 9 month old has gone from eating about 10 ounces of solids, and about 28 ounces of formula a day to barley drinking any formula at all. The past 3 days he’s had about 10 ounces.

I’m concerned bc he has barley any wet diapers, and I’m nervous he’s dehydrated and not getting the nutrients he needs. I haven’t started him on water yet, but if the doctor doesn’t call me back soon to give me the ok for water, I am just going to give him some anyway bc at this point he is probably dehydrated. Has anyone dealt with this? Should I cut back on solids? In the past few days since he stopped drinking as much, he’s been eating more solids.