Level 894 Candy Crush Saga is an orders level, you need to collect 75 purple candies, 20 striped candies and 10 wrapped candies.
There are two UFO's locked in licorice at the bottom of the board, which will give you six of the wrapped candies, so you only need to make four.
A colour bomb/stripe combo will give you most of the stripes you need and hopefully take care of the bomb at the bottom.
Keep your eye on the bombs on the conveyor, although they don't fall down every move, you can't let them count down too low in case you miss the chance to destroy them
The popcorns will give you three colour bombs, which will help keep the bombs under control and also clear the purples if needed.
Stripe/wrap combos near the popcorns will grow two or three of them at the same time.
Level 893 is a tricky level but can be done without boosters as you will see from the video below.
While there are candies in the right column under the ingredient you can use a colour bomb to move the ingredient down, this will also help to make more specials by removing one colour.
Once the chocolate starts to grow you will need strip/wrap combos and a sprinkling of luck to collect the ingredients.
You need to collect 6 ingredients and you will only have one on the board at a time. New ingredients will only fall down once the previous one is out of the exit.
Use your moves wisely and don't try to save specials too long or they are likely to explode when you don't want them to.
I have tried a colour bomb/stripe combo a couple of times but they are so random that they did little damage to the chocolate, so I would't bother wasting moves on setting one up. The best booster to use is a coconut wheel, get it low down and move it upwards or downwards so it will send stripes sideways to clear the chocolate.
Concentrate on sideways stripes and stripe/wrap combos and you should be able to clear Candy Crush Saga level 893.
The main tip I can give is slow down and think about every move.