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after not using them for around 4-5 weeks my paints just went totally watery even when shaking for minutes

Try stirring as well. Sometimes the pigment settles to the bottom of the bottle.

If it's a dropper bottle try adding something into it to stir it when you shake it.

Yep, and droppers can have the tip popped off easily - dig around with the end of a worn-out paint brush and see if everything has congealed in one end of the pot.