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Do nothing so the agreement becomes periodic
If you do not extend or sign a new a fixed term agreement, a periodic agreement automatically comes into place. The periodic agreement continues under the same terms that applied to the fixed term agreement except for the end date.
At any time, the tenant and lessor/agent can agree to end the periodic agreement and begin a new fixed term agreement. For more information, see the general tenancy agreements or moveable dwelling tenancy agreements fact sheet.
Under a periodic agreement, rent may be increased by the lessor/agent giving the tenant two months notice in writing of the increase. However, rent can not be increased unless there has been at least six months since the current amount of rent became payable by the tenant.
Changes to the terms of agreements
Tenants are able to negotiate the terms of the proposed new agreement before they sign it. Tenants can dispute significant changes between agreements for the same property with the lessor/ agent, such as excessive rent increases or whether pets are allowed, after they have signed the new agreement. If dispute resolution is unsuccessful, an application to the Tribunal can be made within 30 days after signing the new agreement, to have the significant change reviewed.
This basically means that since you haven't signed the new lease, you are on a periodic lease (basically it means that you can leave at any time with two weeks notice or they can ask you to leave at any time but have to give you 60 days notice). The terms and conditions are still the same though as it would be on your fixed term agreement so if the fixed term agreement was to include you paying for water, it would be applicable from the start date of that fixed term agreement that you didn't sign. I don't think they can make you back pay it.