If your intention is to create a bog, peat and sand are your best options--perlite will likely not suffice as it will float to the top of the water. The peat must be free of fertilizer and the sand must be free of soluable minerals and salts which are often found in play sand. If you use it, you must thoroughly rinse it (as it seems you did). However, even when washed, play sand is very fine and creates a very dense mixture which may not be favorable for roots to grow in. Thus, silica/quartz pool filter sand (looks white) is the best--it is often larger and has minimal salts.
You may buy large quantities of peat at a local plant nursery, and the silica sand is easily bought at a local pool shop.
I would avoid adding acids or bases to your bog. While it is true that CPs generally favor acidic conditions over basic conditions, there is an optimal pH range for healthy growth. Acidity above or below this range can harm them. The peat in your bog will BY ITSELF likely produce a pH value within the optimal range.
If your intention is to create a bog, I would post a quick question in the Sarracenia forum as many of these people have bogs but some don't read this particular forum.
Good luck.