Use Meteor's accounts-password package with meteor-client-side.
bower install accounts-password-client-side
Add to your index.html:
<script src="https://github.com/idanwe/accounts-password-client-side/raw/master/bower_components/accounts-base-client-side/dist/accounts-base-client-side.bundle.min.js"></script>
<script src="https://github.com/idanwe/accounts-password-client-side/raw/master/bower_components/accounts-password-client-side/dist/accounts-password-client-side.bundle.min.js"></script>