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You actually could but it would be very difficult/dangerous (you would need several grocery stores worth of acetone and peroxide)
TATP is not going to be practical for taking down a bridge. Skip that and just make nitroglycerin, you'll only probably kill yourself doing it.
IIRC it's nontrivial to buy large amounts of nitrate these days without a documented need, precisely because nitric acid's required to make nearly all the good explosives (not just nitroglycerin; nitric acid + easily-available stuff would also suffice for RDX and TNT). That's part of why crazy shit like TATP gets used; the terrorists know it's ludicrously unsafe, they just can't get dynamite (the other part is that counter-terrorists have scanners for nitrogen - I think it's either NMR or X-ray - and again TATP's one of few options that won't show up).
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Most peroxide in stores is hopelessly dilute. Plus, even if you got the good stuff we used in lab in university you'd kill yourself before accomplishing anything.
A home freezer suffices for getting arbitrarily-dilute peroxide to 20% or so (the first eutectic's at around 45%, but I don't think most home freezers get cold enough).
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