Now I know that this might sound pretty obscene from the title, but the question remains: How do one create the sound from guts and gore without killing someone first.
Preparations
Now before you do any of these things below make sure to tell your parents / siblings what you're doing. It might feel strange at first, but it is much better to get the parents into your recordings, so they don't just stumble upon your recordings and delete them by mistake.
Dripping blood:
Start by getting a rag and wet it with as much water you're after. Now depending on what surface you want it to fall on, just take whatever things you have available at home. Now wring out the soaked rag atop of wood, stone, or whatever you want the blood to drip on.
Crunching bones:
Get some dried left over pasta. roll some into a piece of waxed paper, and crunch it with your hands. A bunch of dry branches can do the same thing. Got a dog? Record him / her eating a nice tasty bone. You'll get a few decent crunches from there.
sludgy viscera
Now let's face the viscera. This can also be illustrated by all sorts of food and stuff. The key here is to overcook the food so it's really slushy, watery. So take some overcooked carrots and serve 'em on whatever surface you want the viscera to fall on. Pitch down the sound so it gets a bit darker. Note that when you pour the water from your boiled pasta then it can be used to mimic blood and viscera from a body say cut in half.
Practice makes perfection.
Don't expect to get the best result from scratch. It'll take some practice to get the feeling just right. I've practiced for over 30 years to get my sounds and music right, so I ought to know this.
Stack 'em in layers.
Say that you've made 10 different recordings. Each one has their own special thing that gets the sound just right, but you'll also find that when adding 2 or 3 of them together into one recording then you'll get a much denser result. When Arnold played the Terminator in "Judgement day" then he didn't like the shotgun sound when he faced John the first time, so they ended up layering 20-30 different gunshots together, even canons, to get the sound just right.
Last but not least:
Try to keep it quiet during your recordings. Even hold your breath since it is essentially poorly processed sound / graphics that makes games amateurish. So tell your siblings that you must do these recordings, but they may be with you, if they can keep quiet. Now this is a really good practice for them as well. You could also ask them to help you with the recordings.
Anything else?
Most likely. But this is a good start. I'll post more audio tips & tricks later on.