Is it permissible to disseminate guidance on water conservation in places of worship frequented by people of innovation, and is this considered cooperation in righteousness or indirect material assistance?

Corrupting water and wasting money are forbidden, and preserving water is more paramount. Awareness of the importance of preserving it must be spread. Efforts should be made to guide disbelievers and innovators through legitimate means, and publications inviting people to Islam, explaining the virtue of following the Sunnah and the danger of innovation, should be disseminated, because preserving religion is more emphatic than preserving money. It is not permissible to build churches in Muslim lands, and it is forbidden to assist people of falsehood in their falsehood.