Can I use alka- seltzer thingies to make bath fizzies/ bath bombs?

Yes u can its fine one of it inactive ingredients is actually citric acid and is great for the skin no i wouldnt use it directly on the skin but in bath bomb its abosoluty fine and works great, ok if ur worried at all grab a bar of felz naptha and (1\16th of a table spoon for each bomb depending on how many ur making do the math and calculate how much u would need) felz naptha is great for ur skin , anyway each alkaseltzer tablet has 1000mg of citric acid so u will have to calculate again for how much is need for how many u want to make! Also alka selzer in a sense is a bath bomb on itself if u look at the ingredients it has sodium which is great for ur skin but ill give u even something better get denture cleaning tablets u wont have to worry about cleaning ur tub!!! U can even use that extra margarita salt from last nights party...lol all citric acid is , is sour salts, which is what margarita salt is lemon lime salt Lol but just fyi u should be able to fine pure citric acid at any grocery store that sells canning supplies!!!! Hope this help if u have anymore question hey bathbombmama to the rescue!!