I used frozen water bottles too. But what i've been noticing is that it seems as tho my fog lays low if theres no wind, WHETHER OR NOT i use any form of ice ! I don't get it, but the PVC seems to work with no ice ! I tried this during testing, and also on halloween nite the bottles were melted about 1/2 way thru the nite and it kept on working. However, most of the nite it rose because it was windy and raining. But whenever the wind stopped it layed low as he||even long after the bottles were melted.
But what I have found is that there should be something covering the end of the pipe such as a towel or something to slow the fog down and keep it from exiting too fast, which causes it to rise far more. On halloween i used a bushel of cornstalks i got where i bought our pumpkin. For me at least, it seems to be much more important than having ice !
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