Definitely doable. Feeding fortnightly would still be far in excess of what a young snake in the wild would get, and is more than adequate for any snake, and you don't need to do anything except change the water when you're home (and scrub the bowl - they get a slime covering over time...). It's true that snakes which are fed less grow a bit slower, but the notion that hatchies and younger snakes NEED to be fed very frequently is just an artefact of the captive breeding mentality. Breeders like their animals to get a bit of size on them asap, and most keepers enjoy seeing their animals feed (it's often the easiest way to stimulate movement in what are otherwise very sedentary animals). My own animals, hatchies up to adults, might be fed at most fortnightly, and may go 5-6 weeks between feeds sometimes without ill effects.
As far as watering goes, once again, snakes in the wild will often go for months without access to drinking water. I see pythons around my house here, near Port Macquarie, pretty regularly, and I know they don't have access to drinking water for weeks on end. Most people are used to cats, dogs and birds as pets, and extrapolate that a snake's need for water is similar. Of course it does no harm to have FRESH water available daily, but it is not necessary. Most snakes will drink when fresh water is placed in the enclosure, but most will not drink from that bowl again until the water is changed. Place the bowl at the cool end of the enclosure, and only half fill it, in case the critter decides to take a bath and it overflows in your absence.
As far as heating is concerned, make sure you supply just enough heat to reach the temps you want, and not a massive heat source that will cook your animal in the case of thermostat failure. The safest way to go is to use a 25-50W heat cord under the floor at one end of your enclosure. Pythons do very well with belly heat alone, (I only use an overhead heat source for my GTPs, and haven't used anything but belly heat for my other species for 40 years), so a section of floor heated to the appropriate temperature, with a hide or three on both the warm and cool sections will give the snake a choice of where it wants to be. Strong heat sources are very dangerous during periods of absence or heatwaves, so a source supplying just enough and maybe a little more than needed is the safest way to go.
Go for it and good luck!
Jamie