I’m not sure if you’re taking suggestions for policies, but it strikes me that there isn’t a “capitalist” (or at least, non-socialist) way to reduce homelessness. Rent Allowance would be the obvious way to accomplish this, in the same vein as school and healthcare vouchers. Maybe also Rent Tax Credits?.
I would make the same recommendation for Social Care, unless I’m misunderstanding the scope of that policy (I guess having a voucher system would require like, a state social care and private social care variable etc). Might be a bit much work.
Regarding ways to interact with water shortages and the water industry, my country of Australia has widespread water restrictions and the policy irl has some significant research into the economic/welfare effects. Worth mentioning, at least.
Should food price inform the cost of the Food Stamps policy?
Also, thanks for including Payroll Taxes- they’re my favourite tax to remove in any game I play