Yes I agree.Pet bottles create fountain instead
Only thing I will add is taste your beer all the way along. It is not toxic. You will learn an immense amount from your sensory analysis and be able to reference/compare that in the future.
Trying a bit on your tongue at intervals through the mash is especially good to tell how much sugar is coming out.
Don't be put off if it initially tastes intolerably bitter straight after the boil though: that will mellow out.
Probably best not to taste it during active fermentation as it can have "undesirable" effects on your digestion.