3+ mystery plants thriving despite inexperienced grower.

[LadyBakeneko]

So I bought a pitcher plant from a stall in the local farmer's market, as a sort of housewarming present to myself (My family and I recently moved). I kept the plant in the plastic pot I bought it in, with the sole addition of a water tray so it could water itself whenever I inevitably forgot it existed. I set it on the windowsill in the sun, occasionally gave it tap water (against the recommendation of the seller), and half expected the pitcher plant to die within a fortnight.
That was 7 months ago.
Now the tiny pot is overflowing with plants somehow. The original pitcher plant (some type of Sarracenia I believe) has sprouted several new pitchers, including 2 that are double the height of the others. There are also about a dozen Y-shaped possibly-sundew (Drosera?) sprouts that appeared about a month or 2 later. Finally, there are 2 stems with these teensy little yellow flowers that I'm pretty sure are completely different (maybe Utricularia). This isn't even counting the assortment of greenery hugging the dirt that I don't have a clue about.
Basically, I've been pretty lucky keeping these alive, and it's starting to look like they're going to stick around for longer than I thought. I want to get them a bigger pot, likely a couple planters, but I don't want to screw up whatever it is I'm doing right.
So, anyone know what exactly I have here? I want to look up more specific care instructions.
Thanks in advance!

More pictures can be provided if these aren't clear enough

 

[adnedarn]

The Sarracenia could be literally any hybrid. Something common to some hybrid they made. Most will suggest to not apply a name to it since it would be a guess. The Drosera is a binata form and the Utricularia looks like U. subulata. Either your tap water happens to have low TDS making it ok to use, or enough minerals have just not yet built up in the media to cause a problem- but will. All 3 of those plants can be transplanted into the typical 50/50 mix of peat moss and perlite (make sure it's not miracle grow brand/that the ingredients says there is no fertilizer).