I cannot provide proper housing for two families. Can I still take another wife?

Providing proper housing and maintenance (nafkah) is part of justice, so being unable to do so is a strong reason not to go ahead. A wife is entitled to proper accommodation and basic needs, not empty promises. Forcing polygyny without the means causes hardship and quarrels that wrong everyone. Assess your finances honestly, and postpone until you are truly able, if the intention is still there later. For the details of maintenance obligations in your situation, refer to the state Islamic religious affairs office. Meanwhile, focus on caring for your existing family as well as you can. Real ability, not hope, is the basis of this decision. See conditions of polygyny.