Yes don't be tempted to put too much liquid in, it's easier to add than take away as most of the steam is trapped. I have a 6 pint slow cooker and for a typical chilli type thingy I put about 1/2 litre of stock. As soon as you get in make sure you give it a stir as it can catch a little on the inside of the pot.
Chilli con carne
(All approx quanities, can change depending on what I've got at the time)
1/2 litre beef stock (I use knorr stock cubes
600g lean 5% mince beef
4-5 medium carrots
1 large sweet potato. (I grate all the veg in food processor superquick)
2 onions
1 stick of celery
2 tins peeled plum tomatoes
2tbsp chilli spice medium
1tbsp ground cumin
1 tsp ground pepper
1 tbsp paprika (Spices are too your taste so you may need to fiddle with it a bit) I have been known to bung a small amount of cayenne pepper in too.
Add either 1 tin mixed beans or kidney beans during the last hour (sometimes I put a tin of sweetcorn in too to bulk it out).
Makes about 8 portions in foil trays
If I have peppers etc to use up I'll bung them in too! I make this about once every 4-6 weeks and it's never really had exactly the same things in twice!
If you substitute chilli spices for curry and add things like garam masala, ground coriander etc etc and add a tin of reduced fat coconut milk towards the end, it makes a very tasty tomato coconut curry. I usually use chicken for that (or no meat and will use with leftover roast) and you can freeze it with the milk in.
The chilli takes about 8 mins to prepare if I've got everything out ready!
Obviously make sure everything is thoroughly cooked before eating especially when using meat.
Enjoy experimenting!